JP2011034925A - Member for push-button switch, and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a member for push-button switch hardly inducing a displacement of printing position in manufacturing, and to provide a method of manufacturing the same. <P>SOLUTION: The member for push-button switch 1 includes one or more display portions each having a light-transmissive region P and has a laminated structure 7 of an elastic sheet layer 3 and a silicone rubber layer 4. A decoration layer 5 is provided on at least portion of a surface of the elastic sheet 3 or the silicone rubber layer 4 and the decoration layer 5 is removed to form the light-transmissive region P. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

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

  In recent years, electronic devices such as a mobile phone, a portable music player, a PDA, a remote entry key, or a smart entry key have been required to be thinner. In order to reduce the thickness of an electronic device, it is essential to reduce the thickness of a push button switch provided in the electronic device.

  Therefore, a push button switch member is used in which a large number of switch operation keys (push buttons) are assembled and arranged on a single keypad made of rubber or an elastomer material. As such a push button switch member, for example, one having the following structure is known. FIG. 10 is a cross-sectional view of a conventionally known push button switch member 50. The push button switch member 50 has a rubber-like elastic layer 51 on the operation surface side, and a silicone rubber layer 52 on the back side of the rubber-like elastic layer 51. A plurality of key tops 53 for pressing are arranged on the surface side of the pushbutton switch member 50, that is, on the surface side of the rubber-like elastic layer 51 (see, for example, Patent Document 1).

International Publication WO2007 / 055157

  The pushbutton switch member 50 described in Patent Document 1 has been increasingly used in recent years because it can reduce the number of parts, is easy to assemble, and can be thinned. Furthermore, in order to decorate the member 50 for pushbutton switches, a decoration layer may be formed in the rubber-like elastic body layer 51 by printing or the like.

  In the case where a decorative layer is provided on the pushbutton switch member 50 disclosed in Patent Document 1, for example, it is created as follows. First, a decorative layer is formed on the rubber-like elastic body layer 51. Next, the rubber-like elastic body layer 51 having the decorative layer is placed in the mold. And the rubber-like elastic body layer 51 and the silicone rubber layer 52 which have a decoration layer are integrally molded by arrange | positioning a silicone resin on the arrange | positioned rubber-like elastic body layer 51, and heating and compressing.

  However, when a decorative layer is provided on the pushbutton switch member 50 disclosed in Patent Document 1, there is a problem that the printing position of the decorative layer is likely to be shifted. This is because the rubber-like elastic body layer 51 having the decoration layer is stretched by heat and pressure for integrally forming the rubber-like elastic body layer 51 having the decoration layer and the silicone rubber layer 52. That is, since the rubber-like elastic body layer 51 having the decoration layer is stretched, there is a problem that the position of the decoration with respect to the pushbutton switch member 50 is shifted.

  Accordingly, an object of the present invention is to provide a member for a push button switch that is unlikely to cause a printing position shift during the manufacturing process, and a method for manufacturing the same.

  In order to achieve the above object, one side surface of a member for a push button switch according to the present invention is provided with one or more display portions having a light-transmitting region, and has a laminated structure of an elastic sheet layer and a silicone rubber layer. It is a member, and at least a part of the elastic sheet layer or the silicone rubber layer is provided with a decorative layer, and the transparent region is formed by removing the decorative layer.

  Furthermore, a concave portion or a convex portion may be formed on the surface on which the decorative layer of the elastic sheet layer is provided.

  Furthermore, a decorative layer may be formed on a side surface portion of the concave portion or the convex portion that is erected with respect to the operation surface operated by the user.

  In another aspect of the present invention, one aspect of a method for producing a pushbutton switch member having a laminated structure of an elastic sheet layer and a silicone rubber layer includes a molding step of integrating the elastic sheet layer and the silicone rubber layer, A decorative layer forming step for forming a decorative layer on at least a part of an illumination region for illumination and a light shielding region for shielding light, and a decoration formed on the illumination region. The manufacturing method of the member for pushbutton switches which has the peeling step which peels off a layer.

  Furthermore, it may be preferable that the decorative layer removing step is performed by irradiating a laser beam.

  ADVANTAGE OF THE INVENTION According to this invention, the member for pushbutton switches which cannot produce the shift | offset | difference of a printing position during a manufacturing process, and its manufacturing method can be provided.

It is the top view which looked at the member for pushbutton switches concerning the 1st Embodiment of this invention from the operation surface side. FIG. 2 is an enlarged plan view showing a region indicated by A in FIG. 1 with respect to the push button switch member of FIG. 1. It is sectional drawing at the time of cut | disconnecting the member for pushbutton switches of FIG. 1 by the BB line, and seeing in the direction of the arrow. It is a flowchart explaining the manufacturing method of the member for pushbutton switches which concerns on the 1st Embodiment of this invention. It is sectional drawing when the member for pushbutton switches which concerns on the 2nd Embodiment of this invention is cut | disconnected by the line similar to the BB line of FIG. 1, and it sees in the direction of the arrow. It is sectional drawing at the time of cut | disconnecting the conventional member for pushbutton switches by the same line as the BB line of FIG. 1, and seeing in the direction of the arrow. It is sectional drawing when the member for pushbutton switches which concerns on the modification of this invention is cut | disconnected by the same line as the BB line of FIG. 1, and it sees in the direction of the arrow. It is sectional drawing when the member for pushbutton switches which concerns on the other modification of this invention is cut | disconnected by the same line as the BB line of FIG. 1, and it sees in the direction of the arrow. It is sectional drawing when the member for pushbutton switches which concerns on the other modification of this invention is cut | disconnected by the same line as the BB line of FIG. 1, and it sees in the direction of the arrow. It is sectional drawing for demonstrating the structure of the member for conventional pushbutton switches.

(First embodiment)
First, a push button switch member according to a first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view when the pushbutton switch member 1 according to the first embodiment is viewed from the operation surface side operated by the user. FIG. 2 is an enlarged plan view showing the push button switch member 1 in a region indicated by A in FIG. FIG. 3 is a cross-sectional view showing a cross section when the push button switch member 1 is cut along a plane substantially perpendicular to the operation surface including the line BB in FIG. 1 and viewed in the direction of the arrow. Note that the scale of each layer is not constant for easy viewing of the drawing. Hereinafter, the operation surface side is referred to as the front surface side, and the surface side opposite to the operation surface is referred to as the back surface side.

  As shown in FIG. 3, the pushbutton switch member 1 includes a key top 2, an elastic sheet layer 3, and a silicone rubber layer 4 from the surface side. The elastic sheet layer 3 is laminated on the surface side of the silicone rubber layer 4, and their boundaries are in close contact and integrated. On a part of the surface of the elastic sheet layer 3, a light shielding layer 5 which is an example of a decorative layer is formed. A pressing element 6 is formed on the back side of the silicone rubber layer 4. Hereinafter, the integrated elastic sheet layer 3 and silicone rubber layer 4 are referred to as a laminate 7.

  The key top 2 is a member for the user to press. As the key top 2, there is a member mainly composed of resin, metal, or a composite thereof, and it does not matter whether the member is a single molded body or a molded body composed of a plurality of layers. When the key top 2 composed of a plurality of layers is employed, it is preferable that the surface of the key top 2 is covered with a resin sheet. When the surface of the key top 2 is covered with a resin sheet, the region covered with the resin sheet may be a part or the whole of the key top 2. The resin key top 2 according to the present embodiment includes polycarbonate resin, acrylic resin, acrylonitrile-butadiene-styrene copolymer resin, polypropylene resin, vinyl chloride resin, polystyrene resin, methacrylic resin, polysulfone resin, and polyester resin. Alternatively, each resin such as a polyamide resin can be used, but a particularly preferable resin is a polycarbonate resin or an acrylic resin. In the present embodiment, the key top 2 is composed of a translucent member. Therefore, when light enters from the elastic sheet layer 3 side, the user can visually recognize the light transmitted through the key top 2.

  The elastic sheet layer 3 is a translucent layer mainly composed of a material other than silicone rubber. In this specification, translucency means that light is substantially transmitted, and the total light transmittance is 30% or more, preferably 50% or more. The elastic sheet layer 3 is mainly composed of a material having superior physical strength than the silicone rubber layer 4 and having flexibility. For example, the elastic sheet layer 3 is preferably composed mainly of thermoplastic polyurethane, having a thickness of about 0.03 to 0.2 mm and a Shore A hardness of 20 to 98. By laminating the elastic sheet layer 3 having a physical strength superior to that of the silicone rubber layer 4 and the silicone rubber layer 4, the elastic sheet layer 3 and the silicone rubber layer 4 The physical strength of the laminate 7 is dramatically improved. Since the physical strength of the laminate 7 of the elastic sheet layer 3 and the silicone rubber layer 4 is superior to the layer composed of the silicone rubber layer 4 alone, the physical strength of the pushbutton switch member 1 is improved.

  The silicone rubber layer 4 is a translucent layer laminated on the back side of the elastic sheet layer 3. A pressing element 6 protrudes from the back surface of the silicone rubber layer 4. Specifically, a presser 6 is provided on the back surface of the silicone rubber layer 4 at a position corresponding to the key top 2. Therefore, when the key top 2 is pressed, the presser 6 can push in a switch member (not shown) disposed to face the back surface of the push button switch member 1. In the present embodiment, the pressing element 6 is formed as a part of the silicone rubber layer 4. However, the pressing element 6 may not be formed integrally with the silicone rubber layer 4, but the pressing element 6 formed separately from the silicone rubber layer 4 may be fixed to the silicone rubber layer 4.

  The light shielding layer 5 is a layer that shields light irradiated toward the front surface from an internal light source (not shown) disposed on the back side of the pushbutton switch member 1 so that it is not visible outside the translucent region P. Here, in this specification, light shielding means that light is not transmitted as compared with a light transmitting portion, and indicates a total light transmittance of about 10% or less. In the present embodiment, as shown in FIG. 2, the region where the light shielding layer 5 is not formed, that is, the light transmitting region P, has a one-point difference line positioned slightly inside the outer periphery of the key top 2 as the outer periphery. . The light shielding layer 5 may be decorated not only for light shielding.

  By using the pushbutton switch member 1 as described above, the elastic sheet layer 3 can be made thinner. This is because the laminate 7 composed of the elastic sheet layer 3 and the silicone rubber layer 4 is superior in physical strength to the layer composed only of the silicone rubber layer 4. Moreover, since the laminated body 7 is more excellent in translucency, heat resistance, and cold resistance than the layer which consists only of the elastic sheet layer 3, it becomes the pushbutton switch member 1 which can be illuminated. Furthermore, the laminate 7 is mainly composed of an elastic sheet 3 with poor elasticity and a silicone rubber layer 4 with high elasticity. Accordingly, the pushbutton switch member 1 is easy to press because it is more elastic than the elastic sheet layer 3 having poor elasticity.

  Next, the manufacturing method of the member 1 for pushbutton switches is demonstrated. FIG. 4 is a flowchart for explaining a method of manufacturing the pushbutton switch member 1.

  First, the elastic sheet layer 3 is prepared. As the elastic sheet layer 3, ester-based, urethane-based, styrene-based, olefin-based, and polyamide-based thermoplastic elastomers are particularly preferable from the viewpoint of strength and physical properties. For example, as the elastic sheet layer 3, a sheet mainly composed of an ester-based thermoplastic polyurethane having a thickness of 0.1 mm can be used.

  Note that a primer layer for improving the adhesion between the elastic sheet layer 3 and the silicone rubber layer 4 and a binder layer for improving the adhesion between the primer layer and the elastic sheet layer may be formed on the elastic sheet layer 3 in advance. . For example, as a binder layer, a medium of thermoplastic urethane-based ink (which does not contain a pigment and is composed only of a material blended in the ink as a pigment binder) is formed on the elastic sheet layer 3 by printing. The primer layer can use a silane coupling agent having an epoxy group, an isocyanate group, an ester group, an amino group, an amide group, or the like. Among these, after forming an amino-type silane coupling agent in the elastic sheet layer 3 by printing, it forms by air blowing drying for 30 minutes or more, and making it dry in a thermostat at 60 degreeC for 1 hour.

  Next, the silicone rubber layer 4 is disposed on one side of the elastic sheet layer 3 by coating or the like. Then, the elastic sheet layer 3 on which the silicone rubber layer 4 is disposed is disposed in a molding die. The elastic sheet layer 3 and the silicone rubber layer 4 are press-molded at a pressure of 18 MPa at 120 ° C. for 2 minutes (step S101; molding step). Here, as the silicone rubber layer 4, an addition type silicone rubber which can generally undergo a crosslinking reaction at a low temperature rather than a crosslinking reaction by a peroxide is preferably used. Moreover, when the addition-type silicone rubber used contains a self-adhesive component as an auxiliary agent, the adhesiveness between the elastic sheet layer 3 and the silicone rubber layer 4 is further improved. As an auxiliary agent for improving adhesiveness, for example, an epoxy equivalent (weight of epoxy group per mol) is 100 to 5000 g / 1 mol, and a self-adhesive component having at least one aromatic ring in the molecule Is mentioned.

  In the laminate 7 of the elastic sheet layer 3 and the silicone rubber layer 4 formed in step S101, the light shielding layer 5 is formed on the surface on the elastic sheet layer 3 side (step S102; light shielding layer forming step). For example, the light shielding layer 5 can be formed by applying or spraying a urethane black paint on the entire surface of the laminate 7 and drying it at 80 ° C. for 30 minutes. In addition, when the pushbutton switch member 1 is pressed, the light shielding layer 5 can follow the deformation of the laminated body 7 by using the urethane-based paint. However, not only urethane-based paints but also acrylic paints may be used.

  Next, the light shielding layer 5 corresponding to the illumination region P is removed from the light shielding layer 5 formed on the elastic sheet layer 3 (step S103; light shielding layer removal step). As a method for removing the light shielding layer 5, any method may be used. For example, the light shielding layer 5 can be removed by dissolution with a solvent, etching, or irradiation with a laser beam. In particular, it is preferable to remove the light shielding layer 5 corresponding to the illumination region P by irradiating the illumination region P with a laser beam. This is because the laser processing enables fine processing, so that the light shielding layer 5 can be removed with higher positional accuracy.

  When removing the light shielding layer 5, the laser light is condensed from the side of the elastic sheet layer 3 on which the light shielding layer 5 is formed, and the illumination area is scanned. In the present embodiment, the condensing diameter of the laser beam is set to φ0.05 mm to φ0.5 mm, and the light shielding layer 5 is sublimated by scanning the same path twice, and the light shielding layer 5 is removed. As a laser beam for removing the light shielding layer 5, a carbon dioxide laser, a YAG laser, or a YVO4 laser can be used. In step S103, it is particularly preferable to irradiate the light shielding layer 5 with laser light with an output that can completely remove the light shielding layer 5. When laser light is irradiated with an output that can completely remove the light shielding layer 5, the surface of the elastic sheet layer 3 becomes rough, so that the adhesive force between the key top 2 and the elastic sheet layer 3 is improved. Further, when the illumination region is formed by removing the light shielding layer 5 with an output that can completely remove the light shielding layer 5, the inside of the illumination region is uniformly illuminated. This is because the entire surface of the illumination region is rough, and the light incident on the illumination region is diffused on the rough surface.

  Finally, the key top 2 is pasted at a predetermined position. As a method for bonding the key top 2 and the elastic sheet 3 of the laminate 7, any method may be used. For example, a double-sided tape such as Hibon (registered trademark) YT134-1 (manufactured by Hitachi Chemical Co., Ltd.), an acrylic adhesive, may be interposed between the key top 2 and the elastic sheet 3. Alternatively, bonding may be performed by interposing an adhesive between the key top 2 and the elastic sheet 3.

  In addition, before sticking the key top 2, you may decorate the surface side or the back surface side of the key top 2. FIG. For example, in the present embodiment, printing may be performed with a light-shielding ink on a numerical portion (the numerical portion “1” in FIG. 2) attached to the key top 2 as a display portion. In a state in which the illumination area P is illuminated by an internal light source (not shown), since the areas other than the light-blocking ink layer provided on the key top 2, that is, areas other than the above-described numeric parts shine, the numeric parts are dark portions. Is visually recognized by the user. Further, smoke printing or mirror printing may be performed as a concealing layer on the entire key top 2 so that the illumination area P is not visually recognized when the illumination area P is not illuminated by an internal light source (not shown). Furthermore, a primer may be applied to the key top 2 side or the laminated body 7 side in order to improve the adhesion between the key top 2 and the laminated body 7.

  By employing the manufacturing method as described above, the illumination region P of the pushbutton switch member 1 can be accurately arranged at a desired position. This is because the illumination region P is not formed before the laminate of the elastic sheet layer 3 and the silicone rubber layer 4 is integrally formed. This is because the illumination region P is less likely to be displaced from a predetermined position due to a displacement or the like when the elastic sheet layer 3 is disposed on the mold.

  Further, since the illumination region P of the push button switch member 1 can be accurately arranged at a desired position, the degree of freedom of decoration of the push button switch member 1 is improved. This is because the tolerance for allowing the displacement of the arrangement position of the illumination region P can be reduced.

  Moreover, the workability | operativity in manufacture improves by employ | adopting the above manufacturing methods. This is because it is not necessary to take into account that the elastic sheet layer 3 contracts due to heat and the printing shifts from the shape, so that the positioning can be simplified when the elastic sheet layer 3 is placed in the molding die. Because it can. Moreover, since the positioning is simplified, the manufacturing process can be easily automated.

(Second Embodiment)
Next, a pushbutton switch member 10 according to a second embodiment of the present invention will be described. In the second embodiment, portions common to the first embodiment are denoted by the same reference numerals, and description of the common portions is omitted. In this embodiment, it is assumed that a push button switch member 10 having a configuration different from that of the push button switch member 1 of the first embodiment in FIG. 1 is applied.

  FIG. 5 is a cross-sectional view of the pushbutton switch member 10 taken along the line BB in FIG.

  In the pushbutton switch member 10 according to the second embodiment, the elastic sheet layer 3 protrudes in a convex shape in the direction of the key top 2, and when the protruding portion is viewed from the back side, a recess 8 is formed. The silicone rubber layer 4 fills the inside of the recess 8 and is laminated on the elastic sheet layer 3. Specifically, the laminate 7 of the elastic sheet layer 3 and the silicone rubber layer 4 protrudes to the surface side in a region slightly inside the outer periphery of the key top 2. The key top 2 is bonded to the protruding portion of the laminate 7. In addition, a surface that does not contact the key top 2 in the protruding portion of the laminated body 7, that is, a surface that stands up with respect to the operation surface is hereinafter referred to as a “side portion”.

  In the pushbutton switch member 10, the light shielding layer 5 has an illumination region P whose outer periphery is a portion that slightly covers the outside of the projecting portion of the stacked body 7 with respect to the operation surface. That is, the light shielding layer 5 is provided on the side of the protruding portion.

  In such a push button switch member 10, the key top 2 can be easily pushed. This is because the key top 2 can be displaced in the pressing direction by bending the side when the key top 2 is pushed. Further, when the key top 2 is pushed in, the key top 2 can be pushed down with a smaller pressing force because a movement that pushes down the periphery of the pressed key top 2 does not easily occur.

  The push button switch member 10 is preferably manufactured by a method similar to the method of manufacturing the push button switch member 1. This is because the light shielding layer 5 reliably covers the side of the protruding portion of the stacked body 7. FIG. 6 is a cross-sectional view showing a member for a push button switch when the manufacturing method described in the first embodiment is not used. As shown in FIG. 6, when the light shielding layer 5 does not reliably cover the side of the protruding portion of the laminate 7, the light irradiated from the back side of the pushbutton switch member 10 covers the light shielding layer 5. It will escape from the side that is not. In particular, when the laminate 7 has an uneven shape, light escapes in a direction horizontal to the operation surface. For example, in the case of FIG. 6, light escapes in the right direction. When light escapes in a direction horizontal to the operation surface, a region where illumination is not desired is viewed brightly.

  Moreover, the illumination area | region P enclosed by the outer periphery among the protrusion parts of the laminated body 7 can be made as large as possible. This is because the illumination region P is provided after the elastic sheet layer 3 contracts due to heat during press molding, so that the illumination region P is less likely to be displaced from a predetermined position, and the tolerance for allowing the displacement is reduced. Because it can be done.

  As mentioned above, although the suitable example of the member 1 for pushbutton switches and the member 10 for pushbutton switches which concerns on each embodiment of this invention was demonstrated, this invention is not limited to the above-mentioned embodiment at all, and various deformation | transformation is carried out. It is possible to implement in the form.

  For example, each embodiment refers to a suitable material, hardness, thickness, etc., but is not limited to these values, and other values may be adopted. For example, the thickness of the elastic sheet layer 3 can vary. Further, each value described in the present specification is not limited to the value, and may include an error or a tolerance.

  Moreover, in each embodiment, although the light shielding layer 5 shall be provided in the elastic sheet layer 3, it is not restricted to such a form. For example, FIG. 7 is a cross-sectional view of the pushbutton switch member 20 according to a modification of the present invention cut along a line similar to the line BB in FIG. In the pushbutton switch member 20, a second light shielding layer 5 </ b> B is provided on the key top 2 in addition to the first light shielding layer 5 </ b> A provided on the elastic sheet layer 3.

  In FIG. 7, the first light-shielding layer 5 </ b> A provided on the elastic sheet layer 3 is provided slightly inside the adhesion region between the elastic sheet layer 3 and the key top 2. Therefore, the slightly inner side of the adhesive region between the elastic sheet layer 3 and the key top 2 is used as an illumination window. On the other hand, in FIG. 7, the second light shielding layer 5 </ b> B is provided in a portion other than the light-transmitting region P <b> 1 on the exposed surface of the keytop 2 that does not face the stacked body 7. Here, by forming the translucent region P1 into a shape such as a character or a number, the member 20 for a push button switch in which the character or the number appears to shine. Visibility can be improved because it is possible to illuminate even if characters or numbers that can be displayed on the key top 2 are enlarged.

  Further, in each of the embodiments described above, the light shielding layer 5 is provided on the front surface side of the elastic sheet layer 3, but the light shielding layer 5 may be provided on the back surface side of the elastic sheet layer 3. good. FIG. 8 is a cross-sectional view of a pushbutton switch member 30 according to another modification of the present invention cut along a line similar to the line BB in FIG. In the pushbutton switch member 30, since the light shielding layer 5C is provided in a portion closer to the internal light source (not shown), the amount of light that has entered the elastic sheet layer 3 is less diffused inside the elastic sheet layer 3. It becomes.

  Like the pushbutton switch member 30, when the illumination area P2 and the illumination area P3 are provided separately, and the color of the light illuminated by the illumination area P2 and the illumination area P3 is changed, the illumination area P2 is changed. Light for illuminating and light for illuminating the illumination region P <b> 3 are less likely to be mixed before entering the laminate 7. Further, when the illumination area P2 and the illumination area P3 are divided, the light for illuminating the illumination area P2 and the light for illuminating the illumination area P3 are not mixed in a single direction ( In the case of FIG. 8, it is preferable to use an LED that shines only in the surface direction).

  Further, in the pushbutton switch member 30, it is preferable that the illumination region P2 and the illumination region P3 are arranged on the opposite side 180 degrees with the presser 6 as the center. In such a case, when one of the illumination area P2 and the illumination area P3 is illuminated from the back side of the pushbutton switch member 30, the presser 6 can shield the light from reaching the other illumination area.

  FIG. 9 is a cross-sectional view of the pushbutton switch member 30A according to another modification of the present invention and the substrate 14 disposed on the back side thereof, taken along the line BB in FIG. is there. As shown in FIG. 9, when the illumination region P2 and the illumination region P3 are provided separately, a projection 13 that blocks between adjacent LEDs 11 is provided in order to shield the light from reaching the other illumination region. May be. The protrusion 13 may be provided on the push button switch member 30 side, or may be provided on the substrate 14 side. Furthermore, a light shielding protruding portion may be provided together with the pressing element 6 at a position corresponding to the back surface of the key top 2.

  Moreover, in each above-mentioned embodiment, although the light shielding layer 5 is provided as a decoration layer, a decoration layer is a semi-light-shielding layer whose translucency or a total light transmittance is about 10 to 40%. There may be. Even a light-transmitting or semi-light-shielding layer can be provided on the laminate 7 with high positional accuracy. Further, the front side of the light shielding layer 5 may be further decorated, or the light transmitting regions P, P1, P2, and P3 may be decorated.

  In each of the above-described embodiments, the light-shielding layer forming step (step S102) is performed after forming the laminated body 7 in the forming step (step S101). However, step S101 and step S102 are opposite. May be. However, when the laminated body 7 is provided with a concave portion or a convex portion as in the side portion of the second embodiment, the formed light shielding layer 5 is stretched by press molding or the like, and the light shielding layer 5 becomes thin. There is a possibility that the light-shielding property may decrease.

1, 10, 20, 30, 30A Pushbutton switch member 2 Key top 3 Elastic sheet layer 4 Silicone rubber layer 5 Light shielding layer (decorative layer)
6 Presser 7 Laminate (Laminated structure of elastic sheet layer and silicone rubber layer)
8 recessed part P, P1, P2, P3 illumination region S101 shaping | molding step S102 light shielding layer (decoration layer) decoration layer formation step S103 light shielding layer (decoration layer) removal step

Claims (5)

A pushbutton switch member having one or more display portions having a light-transmitting region and having a laminated structure of an elastic sheet layer and a silicone rubber layer,
At least a part of the elastic sheet layer or the silicone rubber layer is provided with a decorative layer,
A member for a pushbutton switch, characterized in that the translucent region is formed by removing the decorative layer. In the member for pushbutton switches according to claim 1,
A member for a pushbutton switch, wherein a concave portion or a convex portion is formed on a surface of the elastic sheet layer on which the decorative layer is provided. In the member for pushbutton switches according to claim 2,
A member for a pushbutton switch, wherein the decorative layer is formed on a side surface portion of the concave portion or the convex portion that is erected with respect to an operation surface operated by a user. In the manufacturing method of the member for pushbutton switches which has one or more display parts which have a translucent field, and has a lamination structure of an elastic sheet layer and a silicone rubber layer,
A molding step of integrating the elastic sheet layer and the silicone rubber layer;
A decorative layer forming step for forming a decorative layer on both of the elastic sheet layer or the silicone rubber layer on at least a part of the light transmitting region and at least a part of the light shielding region for shielding light;
A decorative layer removing step for removing the decorative layer formed in the light-transmitting region;
A method for manufacturing a member for a push button switch, comprising: In the manufacturing method of the member for pushbutton switches according to claim 4,
The method for producing a member for a push button switch, wherein the decoration layer removing step is performed by irradiating a laser beam.

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