JP4527628B2 - Cover member for pushbutton switch - Google Patents

Description

  The present invention relates to a pushbutton switch cover member used in an electronic apparatus having an illumination function.

  2. Description of the Related Art Conventionally, for example, a push button switch cover member used in an input unit of a mobile phone or the like has an illumination function for illuminating a key top portion constituting the push button in order to ensure visibility in a dark place. Thereby, even when the user uses the mobile phone in a dark place, the function of each push button can be easily recognized.

Patent Document 1 below discloses a technique related to a member for an illuminated pushbutton switch in which an EL (electroluminescence) sheet is used as a member for realizing the illumination function described above. The EL sheet disclosed in Patent Document 1 is positioned in a state of close surface contact between an upper pad member made of silicone rubber or synthetic resin and a base pad member.
JP 2003-7161 A

  By the way, in the member for pushbutton switches comprised as mentioned above, since the base pad member is formed in the whole surface of the non-light-emitting surface of EL sheet | seat, the click feeling when pressing a keytop will fall.

  Accordingly, an object of the present invention is to provide a pushbutton switch cover member that can improve the click feeling when a key top is pressed in order to solve the above-described problems.

  The cover member for a pushbutton switch of the present invention is formed on a plurality of key tops, an elastic layer formed on the lower surface side of the key top, and a lower surface side of the elastic layer, and illuminates the key top from below. An EL sheet, a resin layer formed on a part of the lower surface side of the EL sheet, and a protrusion formed on the lower surface side of the resin layer, the resin layer in a range including at least a portion directly above the protrusion It is formed.

  According to this invention, since the resin layer can be formed only on a part of the lower surface side of the EL sheet, it is possible to improve the click feeling when the key top is pressed. Moreover, since the resin layer can be formed in a range including at least the portion directly above the protrusion, the stress applied to the protrusion when the key top is pressed can be dispersed. Thereby, the situation where the specific location of the light emission part of EL sheet | seat can be prevented can be prevented.

  In the cover member for a pushbutton switch of the present invention, the EL sheet has at least a transparent electrode, a light emitting layer, a dielectric layer, and a counter electrode, and the resin layer is a conductive wire for connecting the transparent electrode and the counter electrode to each other It is preferable that the film is further formed in a range including a portion immediately below.

  If it does in this way, disconnection of the transparent electrode side conducting wire and the counter electrode side conducting wire that may be caused by repeated pressing of the key top can be prevented. Thereby, the non-lighting of the light emission part can be prevented.

  In the pushbutton switch cover member of the present invention, a rib is further provided on the lower surface side of the resin layer and directly below the key top, and the resin layer further includes a range including the portion directly above the rib. Preferably it is formed.

  In this way, it is possible to reduce deformation that occurs locally between the rib and the key top when the key top is pressed.

  The cover member for a push button switch according to the present invention preferably further includes an adhesive layer formed between the EL sheet and the resin layer.

  In this way, the EL sheet and the resin layer can be bonded together by the bonding process without being integrally formed by hot press molding, so that deformation due to thermal history and pressure can be suppressed, and misalignment and curling can be prevented. Generation can be reduced. Therefore, the yield can be improved and the light emission luminance can be improved.

  According to the push button switch cover member of the present invention, it is possible to improve the click feeling when the key top is pressed.

  Embodiments of a cover member for a push button switch according to the present invention will be described below with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted.

  First, with reference to FIGS. 1-3, the structure of the cover member for pushbutton switches in embodiment of this invention is demonstrated. FIG. 1 is a view of a pushbutton switch cover member according to an embodiment as viewed from directly above, and FIG. 2 is a view taken along the line II-II in FIG. FIG. 3 is an enlarged view of a part of the push button switch cover member shown in FIG.

  The pushbutton switch cover member 1 is roughly divided into a key top 10, a silicone rubber layer 20 (elastic body layer), an EL sheet 30, and a resin layer 40.

  Of the resin layer 40, a pusher 41 (protruding portion) protruding downward is formed in a portion directly below the key top 10, and a rib 42 protruding downward is provided between the portions immediately below each key top 10. It is formed. The pusher 41 is provided to press the metal disc spring member 91 on the circuit board 90. The rib 42 prevents a situation in which the key top 10 sinks due to depression of the key top 10 or an adjacent key top 10 is interlocked when the push button switch cover member 1 is incorporated into the product. It is provided to do. That is, the rib 42 is provided for the purpose of positioning the pushbutton switch cover member 1 with respect to the moving direction of the key top 10.

  Adhesive layers 50 and 55 for adhering the respective members are formed between the key top 10 and the silicone rubber layer 20 and between the EL sheet 30 and the resin layer 40. The adhesive layers 50 and 55 are formed of an adhesive or an adhesive. As the adhesive or pressure-sensitive adhesive, for example, an acrylic, epoxy, silicone, urethane, cyanoacrylate, or urethane acrylate adhesive or pressure-sensitive adhesive can be used.

  As shown in FIG. 2, the pushbutton switch cover member 1 is incorporated into a product as a part of the pushbutton switch by being positioned and fixed on the circuit board 90. The pushbutton switch becomes conductive when the metal disc spring member 91 pushed down by the pusher 41 contacts the fixed contact 92.

  The silicone rubber layer 20 is formed on the light emitting surface side of the EL sheet 30. Thereby, adhesiveness with the case of the product which covers the upper part of the cover member 1 for pushbutton switches can be improved, and waterproofness can be improved. That is, the packing effect can be achieved by forming the silicone rubber layer 20. Furthermore, by providing the ribs 20r on the outer periphery of the silicone rubber layer 20, the silicone rubber layer 20 can be made thick, so that the adhesion with the case of the product covering the top can be further improved.

  The thickness of the silicone rubber layer 20 is preferably 0.01 mm to 0.3 mm, and more preferably 0.04 mm to 0.2 mm. Thereby, the light emission luminance can be ensured, and the push button switch can be thinned. If the thickness of the silicone rubber layer 20 is too thin, it will be difficult to form the silicone rubber layer 20 to a uniform thickness, which will cause unevenness in the thickness.

  As a method for laminating the silicone rubber layer 20 on the EL sheet 30, for example, there is a method in which a primer is applied to the light emitting surface side of the EL sheet 30 and then the uncured silicone rubber is cured by injection molding or compression molding. The silicone rubber used in this case may be either a liquid type or a millable type silicone rubber, but by using a low viscosity liquid type silicone rubber, damage to the EL sheet 30 can be further reduced. It is possible and preferable. As another method, for example, there is a method in which liquid silicone is uniformly applied to the light emitting surface side of the EL sheet 30 by screen printing or a coater, and then cured by heat treatment. Here, by using a liquid type or a millable type silicone to which an adhesive component is added, complicated steps such as primer treatment can be omitted, and work efficiency can be improved.

  The EL sheet 30 will be described with reference to FIG. As shown in FIG. 3, the EL sheet 30 includes a transparent insulating layer 31, a transparent electrode 32, a light emitting layer 33, a dielectric layer 34, a counter electrode 35, and an insulating layer 36. Here, the transparent insulating layer 31 of the EL sheet 30 becomes a light emitting surface, and the insulating layer 36 becomes a non-light emitting surface. Note that an EL element is formed by the transparent electrode 32, the light emitting layer 33, the dielectric layer 34, and the counter electrode 35.

  As shown in FIGS. 1 and 3, in the EL sheet 30, a transparent electrode side conducting wire 32 w for connecting the transparent electrodes 32 and a counter electrode side conducting wire 35 w for connecting the opposing electrodes 35 are provided in the EL sheet 30. These terminals (not shown) are wired as one end. As a result, a predetermined voltage is supplied to each electrode.

  The transparent insulating layer 31 is, for example, polyethylene terephthalate (hereinafter referred to as PET), polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polypropylene, polystyrene, polyamide, polymethyl methacrylate, polyurethane, polyamide, or an alloy or copolymer thereof. Or a multilayer product obtained by laminating several kinds of films. In particular, it may be formed of PET having a thickness of 12 μm to 100 μm, more preferably 25 μm to 75 μm. Further, for example, it may be formed by printing a urethane-based, acrylic-based, urethane acrylate-based, polyester-based, epoxy-based or vinyl-based transparent ink.

  The transparent electrode 32 is made of, for example, indium tin oxide (ITO). Alternatively, a light-transmitting conductive polymer such as polypyrrole, polyaniline, or polythiophene may be used. In particular, when formed from poly (3,4-ethylenedioxythiophene) (PEDOT), lower resistance and higher transparency can be realized.

  The light emitting layer 33 is formed by, for example, dispersing inorganic phosphor powder such as zinc sulfide coated with a moisture-proof coating in a binder. Examples of the binder include fluorine-based, polyester-based, acrylic-based, and epoxy-based resins and rubbers, or copolymers thereof.

  The dielectric layer 34 is formed, for example, by dispersing dielectric powder such as barium titanate or titanium oxide in a binder. The binder is the same as the binder used for the light emitting layer 33.

  The counter electrode 35 is made of, for example, a metal or alloy such as gold, silver, copper, or nickel, or a conductive filler such as carbon black or graphite, and a polyester-based, acrylic-based, urethane-based, silicone-based, epoxy-based resin or rubber. Or a conductive film made of a dispersion of these copolymers.

  The insulating layer 36 is formed of, for example, a polyester-based, acrylic-based, polycarbonate-based, silicone-based or fluorine-based resin or rubber, or a composite thereof.

  As shown in FIG. 4, the resin layer 40 is formed in a range including the key top 10, a portion immediately below the transparent electrode side conducting wire 32 w and the counter electrode side conducting wire 35 w, and a portion directly above the rib 42. In this way, by forming the resin layer 40 only in a part between the key tops 10, the thickness between the key tops 10 is reduced, and the key tops 10 easily move independently. A feeling can be realized.

  Further, by forming the resin layer 40 so as to include at least a range wider than the contact surface with the pusher 41, the stress applied to the pusher 41 when the key top 10 is pressed can be dispersed. Thereby, the situation where the specific location of the light emission part of EL sheet 30 will be damaged can be prevented. On the other hand, if the resin layer 40 is formed in a range that exceeds the outer periphery of the key top 10, the click feeling when the key top 10 is pressed decreases, and therefore the resin layer 40 is substantially equivalent to the outer periphery of the key top 10. It is preferable to form within the range.

  Further, by further forming the resin layer 40 in a range including a portion immediately below the transparent electrode side conductive wire 32w and the counter electrode side conductive wire 35w, the transparent electrode side conductive wire 32w and the transparent electrode side conductive wire 32w that can be generated by repeatedly pressing the key top 10 and The disconnection of the counter electrode side conductor 35w can be prevented, and consequently the non-lighting of the light emitting portion can be prevented. The resin layer 40 formed in this range is preferably formed with a width equal to or greater than the width of the transparent electrode side conducting wire 32w and the counter electrode side conducting wire 35w.

  Further, the resin layer 40 is further formed in a range including the portion immediately above the rib 42 to reduce deformation locally generated between the rib 42 and the key top 10 when the key top 10 is pressed. Can be made.

  The resin layer 40 is, for example, a resin made of a modified product such as polyacryl, polystyrene, polyester, polyester polyol, polyester ether, polyurethane, polyphenylene sulfide, silicone, polycarbonate, or an alloy or copolymer thereof, or silicone rubber or urethane rubber. It is formed of a thermosetting elastomer or a thermoplastic elastomer.

  The thickness of the resin layer 40 is preferably 12 μm to 100 μm, and more preferably 25 μm to 75 μm. Further, it is preferably a resin or elastomer having a durometer A of 50 degrees or more. Thereby, while being excellent in a click feeling, the resin layer 40 which also has a reinforcement effect can be formed.

  The pusher 41 is a thermosetting resin such as polyacryl, polystyrene, polyester, polyester polyol, polyester ether, polyurethane, polyphenylene sulfide, silicone, polycarbonate, or an alloy or copolymer thereof, or silicone rubber or urethane rubber. It is made of a flexible elastomer or a thermoplastic elastomer. Considering a good click feeling, the pusher 41 is preferably the resin or the elastomer having a durometer A hardness of 50 degrees or more, more preferably a hardness of 70 degrees or more in the durometer A.

  As a method for integrating the resin layer 40 and the pusher 41, for example, a photocurable resin (for example, acrylic, methacrylic, styrene, polyester, polyester polyol, polyester ether, allyl phthalate, urethane) can be used. , Silicone-based, epoxy-based or phenol-based resin) is poured into a molding die dug into a pusher shape, and a resin layer 40 (for example, acrylic, methacrylic, styrene, polyester, urethane) There is a method in which a resin such as a system, a silicone, an epoxy, or a polycarbonate is covered and integrated by irradiation with ultraviolet rays.

  As another method, for example, there is a method in which a pusher 41 is formed by potting a resin on a sheet made of the resin or the elastomer for forming the resin layer 40 and integrated.

  Further, as another method, for example, there is a method in which silicone rubber is molded by compression molding or injection molding and integrated by a molding die in which the shapes of the resin layer 40 and the pusher 41 are dug.

[Example 1]
Next, with reference to FIG. 5 and FIG. 6, the Example of the cover member 1 for pushbutton switches which concerns on this invention is described.

  First, as shown in FIG. 5 (a), a conductive polymer (Augercon P3040: trade name made by Agfa) is screen-printed on a PET film 31 (Lumirror: trade name made by Toray Industries, Inc.) having a thickness of 25 μm to form a transparent electrode. 32 was formed.

  Next, on the transparent electrode 32 shown in FIG. 5 (a), a phosphor paste (8155N EL medium: trade name made by DuPont), a dielectric paste (8153N EL insulator paste: trade name made by DuPont), carbon paste (7144 EL carbon conductor paste: trade name made by DuPont), silver paste (ED6022SS: trade name made by Atchison), and insulating paint (ED452SS: trade name made by Atchison) were sequentially screen-printed, and light emitting layer 33, dielectric The body layer 34, the counter electrode 35, the counter electrode side conducting wire 35w, and the insulating layer 36 were formed. Thereby, the EL sheet 30 shown in FIG. 5B was formed.

  Next, as shown in FIG. 5C, a protective film F for handling is adhered to the insulating layer 36 side of the molded EL sheet 30, while a primer (DY39) is formed on the transparent insulating layer 31 of the EL sheet 30. -115: Toray Dow Corning Co., Ltd. product name) is applied, and two liquid silicone rubber (KE-1950-60A / B: Shin-Etsu Chemical Co., Ltd. product name) before curing is placed thereon, 120 ° C, A silicone rubber layer 20 having a thickness of 0.1 mm was formed by hot press molding under conditions of 3 minutes.

  Next, two liquid silicone rubbers (KE-1950-60A / B: trade name, manufactured by Shin-Etsu Chemical Co., Ltd.) are applied in a molding die and compression molded at 120 ° C. for 3 minutes, and then at 200 ° C. for 1 It was put into the time dryer. This molding die is provided with a digging of a resin layer 40 shape, a pusher 41 shape and a rib 42 shape. Thereby, the resin layer 40 having the pusher 41 and the rib 42 shown in FIG. 6D was molded. Thereafter, the resin layer 40 having the pusher 41 and the ribs 42 was cut out except for portions corresponding to the key top 10 and the conducting wires 32w and 35w, thereby obtaining the resin layer 40 shown in FIG.

  Next, on the surface of the resin layer 40 shown in FIG. 6D where the pusher 41 is not formed, 100 parts by weight of an adhesive (Sigrip 529: product name manufactured by Permacol) and a curing agent (SRC18: product name manufactured by Permacol) ) 6 parts by weight and a mixture of 10 parts by weight of toluene as a diluent are applied to form an adhesive layer 55, on which the EL sheet 30 integrated with the silicone rubber layer 20 shown in FIG. The insulating layer 36 side was mounted and adhered. Thereby, the member shown in FIG.6 (e) was shape | molded.

  Finally, an adhesive was applied on the silicone rubber layer 20 of the member shown in FIG. 6 (e) to form the adhesive layer 50, and the key top 10 was placed thereon and adhered. As a result, the pushbutton switch cover member 1 shown in FIG. 3 was formed.

  Thus, in the pushbutton switch cover member 1 according to the present invention, the resin layer 40 is formed on the non-light emitting surface of the EL sheet 30. Therefore, the silicone rubber layer 20 may be formed only on the light emitting surface side of the EL sheet 30. As a result, the process of hot press molding silicone rubber can be made only on one side, so that deformation due to thermal history and pressure can be suppressed compared to the case of hot press molding on both sides, and displacement and curl Generation can be reduced. Therefore, the yield can be improved and the light emission luminance can be improved.

[Modification of resin layer]
The resin layer 40 in the above-described embodiment is formed in a range including the key top 10, the transparent electrode side conductive wire 32 w and the portion immediately below the counter electrode side conductive wire 35 w and the portion directly above the rib 42. The range is not limited to this. For example, as shown in FIG. 7, the resin layer 40 may be formed in a range including a portion immediately below the key top 10 and a portion immediately above the rib 42, or only in a range including a portion immediately below the key top 10. It is good also as forming. Thus, since the thickness between each keytop can be made thin by not forming the resin layer 40 between each keytop 10 as much as possible, a favorable click feeling can be implement | achieved. Further, if the resin layer 40 is formed only on a part of the lower surface side of the EL sheet, for example, as shown in FIG. 8, the resin layer 40 may be formed in a single sheet shape.

  Here, a method for manufacturing the pushbutton switch cover member according to the present invention will be described. The method for manufacturing the cover member for a pushbutton switch according to the present invention includes a step of forming the silicone rubber layer 20 on the light emitting surface side of the EL sheet 30 that illuminates the key top 10 from below, and a resin having a pusher 41 on the lower surface side. A step of forming the layer 40, a step of cutting the resin layer 40 into a predetermined shape, a step of bonding the non-light emitting surface of the EL sheet 30 and the upper surface of the resin layer 40, and the key top 10 with the silicone rubber layer 20 The predetermined shape is a shape for forming the resin layer 40 on a part of the lower surface side of the EL sheet 30 and at least including a portion directly above the pusher 41. It is characterized by being. The EL sheet 30 includes at least a transparent electrode 32, a light emitting layer 33, a dielectric layer 34, and a counter electrode 35. The predetermined shape connects the resin layer 40 to the transparent electrodes 32 and the counter electrodes 35. It is the shape for making it form further in the range including the direct lower part of the conducting wires 32W and 35W for performing. Furthermore, the resin layer 40 further includes ribs 42 on the lower surface side of the resin layer 40 and between the portions immediately below the key tops 10, and the predetermined shape is such that the resin layer 40 is attached to the ribs 42. It is a shape for further forming also in the range including the immediately upper part.

[Comparison result]
Next, a pushbutton switch cover member having the resin layer 40 shown in FIG. In addition, since the shaping | molding method of Example 2 is the same as that of Example 1 mentioned above, the description is abbreviate | omitted.

  Moreover, in order to confirm the effect of Example 1 and Example 2, the comparative example was shape | molded. In this comparative example, the resin layer of the pushbutton switch cover member 1 in Example 1 is formed into a sheet shape by hot press molding using silicone rubber. The molding method of this comparative example will be briefly described. First, since the method for molding the EL sheet and the method for molding the silicone rubber layer on the transparent insulating layer of the EL sheet are the same as those in Example 1, their descriptions are omitted. Next, a primer (DY39-115: trade name manufactured by Toray Dow Corning) was applied on the insulating layer of the EL sheet, and placed in a molding die. When arranged in the molding die, the insulating layer was placed on the surface facing the surface in which the resin layer, pusher and rib shapes of the molding die were dug. Next, 2 liquid silicone rubber (KE-1950-60A / B) was apply | coated on the insulating layer, and the resin layer was shape | molded by carrying out hot press molding. Finally, in the same manner as in Example 1, a key top was placed on the adhesive applied on the silicone rubber layer and adhered. Thereby, the cover member for pushbutton switches as a comparative example was shape | molded. In the comparative example, a so-called defective product in which a non-lighted portion was generated in the initial state occurred. This is because, in the comparative example, since hot press molding of silicone rubber is performed twice, excessive heat and pressure are applied to the EL sheet, and fine cracks are generated in each layer of the EL sheet.

Next, Table 1 shows the results of an attempt to perform a keystroke test using the above-described Example 1, Example 2, and Comparative Example as test bodies.

  As one keystroke test, 50,000 keystrokes were performed with a load of 3 kg, and the lighting state before and after the keystroke was measured. In addition, as another keystroke test, one million keystrokes were performed with a load of 500 g, and the lighting state after the keystroke was measured.

  The measurement conditions for each item shown in Table 1 are as follows. As for the luminance, the luminance of the light emitting part of the test body was measured at an applied voltage of AC 100 V and 400 Hz. The click feeling was determined by placing the movable contact of the specimen on the fixed electrode and pushing it. The lighting state after the keystroke test was determined visually by the lighting state when AC 100 V and 400 Hz were applied after the keystroke test.

  First, as shown in Table 1, the brightness of Example 1 and Example 2 is higher than that of the comparative example. This is because in Example 1 and Example 2, the hot press molding of silicone rubber is performed once, whereas in the comparative example, the hot press molding of silicone rubber is performed twice. The EL element tends to have a shorter life as the temperature increases. This lifetime is generally represented by the half life of the luminance. Therefore, the brightness of the comparative example exposed for a long time in a high temperature state is lower.

  Next, with respect to the click feeling, as shown in Table 1, Example 2 was the best. This is because the formation range of the resin layer in Example 2 is limited to a range including the portion immediately below the key top and the portion directly above the rib, and the portion immediately below the key top is formed independently. To do. In the first embodiment, compared to the second embodiment, the resin layer is further formed in the portion directly under the conductive wire, and the portion directly under the key top is connected to the formed portion. Although it was slightly inferior, a good click feeling was obtained. On the other hand, in the comparative example, since the resin layer covered the entire non-light emitting surface of the EL sheet, the click feeling was remarkably bad.

  Next, with respect to the lighting state after the keystroke test, as shown in Table 1, Example 1 and Example 2 showed no abnormality in the lighting state after any keystroke test. Here, in Example 1, since the resin layer is further formed also in the part directly under a conducting wire compared with Example 2, the conducting wire part is reinforced rather than Example 2. FIG. Therefore, the effect of preventing disconnection due to repeated deformation due to keystroke increases. On the other hand, in the comparative example, a non-lighting portion was generated around the pusher after one keying test, and was not lighted due to a disconnection after the other keying test. This is because, in the comparative example, since the silicone rubber is subjected to hot press molding twice, fine cracks are generated in each layer of the EL sheet as described above, and the lead wire is repeatedly deformed and impacted by keystroke. It is thought that it was disconnected.

  Here, in general, the durability required from the market is 1 million times, so both Example 1 and Example 2 achieve durability exceeding the required level of the market. Further, under severe conditions where the number of keystrokes exceeds 1 million, it is preferable to form the resin layer 40 that also protects the transparent electrode side conductor 32w and the counter electrode side conductor 35w as in the first embodiment. It is done.

  In addition, the resin layer 40 and the EL sheet 30 in the above-described embodiment are integrated by the adhesive layer 55 formed of an adhesive or a pressure-sensitive adhesive. However, if the resin layer 40 and the EL sheet 30 are joined together, The entire surface does not necessarily have to be bonded. 9 to 11 show application examples of an adhesive or a pressure-sensitive adhesive to the resin layer 40. FIG. FIG. 9 shows a state in which an adhesive or a pressure-sensitive adhesive is applied to the entire surface of the resin layer 40. FIG. 10 shows a state in which only the periphery 41r immediately above the pusher 41 and the part 42r directly above the rib 42 are bonded. FIG. 11 shows a state where an adhesive or a pressure-sensitive adhesive is applied, and FIG. 11 shows a state where the adhesive or the pressure-sensitive adhesive is applied in the form of dots by screen printing.

It is the figure which looked at the cover member for pushbutton switches in embodiment from right above. It is an II-II arrow line view of FIG. It is the figure which expanded and showed a part of cover member for pushbutton switches shown in FIG. It is the figure which looked at the resin layer from right above. It is a figure for demonstrating the manufacturing method of the cover member for pushbutton switches. It is a figure for demonstrating the manufacturing method of the cover member for pushbutton switches. It is the figure which looked at the resin layer in a modification from right above. It is the figure which looked at the resin layer in a modification from right above. It is a figure which shows the example of application | coating of the adhesive agent or adhesive to a resin layer. It is a figure which shows the example of application | coating of the adhesive agent or adhesive to a resin layer. It is a figure which shows the example of application | coating of the adhesive agent or adhesive to a resin layer.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cover member for pushbutton switches, 10 ... Key top, 20 ... Silicone rubber layer, 20r ... Rib, 24 ... Metal disc spring member, 30 ... EL sheet, 31. ..Transparent insulating layer, 32 ... transparent electrode, 32w ... transparent electrode side conductor, 33 ... light emitting layer, 34 ... dielectric layer, 35 ... counter electrode, 35w ... counter electrode Side conductors, 36 ... insulating layer, 40 ... resin layer, 41 ... pusher, 42 ... rib, 50, 55 ... adhesive layer, 90 ... circuit board, 91 ... metal Plate spring member, 92... Fixed contact.

Claims (4)

Multiple key tops,
An elastic layer formed on the lower surface side of the key top;
An EL sheet formed on the lower surface side of the elastic body layer for illuminating the key top from below;
A resin layer formed on a part of the lower surface side of the EL sheet;
A protrusion formed on the lower surface side of the resin layer,
The push button switch cover member, wherein the resin layer is formed in a range including at least a portion immediately above the protrusion. The EL sheet has at least a transparent electrode, a light emitting layer, a dielectric layer, and a counter electrode,
2. The pushbutton switch cover member according to claim 1, wherein the resin layer is further formed in a range including a portion immediately below a conductive wire for connecting the transparent electrodes and the counter electrodes. A rib is further provided on the lower surface side of the resin layer and directly under the key top,
3. The pushbutton switch cover member according to claim 1, wherein the resin layer is further formed in a range including a portion immediately above the rib.   The cover member for a pushbutton switch according to any one of claims 1 to 3, further comprising an adhesive layer formed between the EL sheet and the resin layer.

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