JP3028642U - Electromagnetic wave shield touch switch panel - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] A touch switch panel having a new structure in which EMI shield for electric / electronic / communication equipment is completely provided is industrially simple, easy, and economical without being restricted by a housing shape or design. provide. SOLUTION: The outer layer resin molded body (3) forming the surface layer excluding the pushed portions (7, 8) and the pushed portions (7, 8)
And a plastic film or sheet (1) located inside the (3) except that the
Electromagnetic wave shield material (2) located inside the
An electromagnetic wave shield touch switch panel having a layered integrated structure composed of an inner layer resin molded body (4) located inside the substrate.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to an electromagnetic wave shield touch switch panel used in electronic / electrical devices and communication devices.

[0002]

[Prior art]

 Electronic and electrical equipment and communication equipment are developing and overflowing in the world, but some kind of preventive measures must be taken against the electromagnetic interference (hereinafter abbreviated as EMI) generated from them. On the other hand, touch switches, which are effective and functional against water, dust, dirt, etc., have been widely used in recent years as switches essential to these devices. Needless to say, EMI countermeasures must be taken for the touch switch panels themselves of the above-mentioned devices, especially portable communication devices and OA devices.

However, since the back surface of the touch switch panel of these portable devices has many ribs and bosses and has a very complicated shape, a metal having a comparatively good EMI shielding effect is obtained. It is technically difficult to achieve a perfect shield even if a method such as sticking foil or vapor-depositing metal is attempted, and the metal plating method and the coating method of conductive paint, which are most widely used at present, meet the standards. It is difficult to obtain a good shielding effect, and it takes a lot of labor and cost, but there is a problem that the reliability is poor. In addition, the touch switch panel is manufactured by preforming a transparent film for the surface layer, inserting it, and then performing injection molding, which requires a lot of labor and manufacturing steps, and is more portable. In the case of equipment, there was a problem that surface decoration such as graining was not possible in order to give a feeling of touch and a sense of quality.

[0004]

The present invention solves the above-mentioned problems of the prior art all at once, reduces the number of steps, and obtains a design and structurally novel touch switch panel obtained by a simplified manufacturing method. It is an object of the present invention to provide an EMI shield touch switch panel in which the EMI shield having a high shield effect and good reliability is completely applied to the panel regardless of the structure or shape. .

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, the present inventor first studied the manufacturing process of the touch switch panel, and as a result, found a molding method of ejecting from the front of the surface layer film, contrary to the conventional method. Succeeded in omitting the molding (thermoforming) process. The touch switch panel in which the EMI shield countermeasure is perfected by adding the technique of insert molding of the EMI shield material (Japanese Patent Laid-Open No. Hei 5-102694) filed earlier by the present inventor to the manufacturing method. We have found that the following can be obtained and completed the present invention.

That is, according to the present invention, except that the outer layer resin molded body (3) forming the surface layer excluding the pushing portions (7, 8) and the pushing portions (7, 8) are exposed on the surface, A plastic film or sheet (1) located inside (3), an electromagnetic wave shield material (2) located inside (1), and an inner layer resin molded body located inside (2). An electromagnetic wave shield touch switch panel having a layered integrated structure consisting of (4) is provided.

[0007]

[Embodiment of device]

 The configuration of the present invention and its embodiment will be described in detail below with reference to the drawings. The EMI shield touch switch panel of the present invention basically has a layered integrated structure as shown in the sectional view of FIG. 1 in FIG. 2 is a plastic film or sheet. As the plastic, a transparent polymer having appropriate hardness and resistance, for example, a polyethylene terephthalate (PET) resin, a polycarbonate resin, a vinyl chloride resin, a styrene resin or the like is used.

Also, elastomers having a soft touch feeling, such as urethane elastomer, silicone rubber, SBR, etc., can be used. In the case of the former transparent plastic film, it is suitable for a touch switch panel in which characters, figures, etc. are printed on the back side or the printed films are pasted together so that they can be seen from the front side.

Reference numeral 2 in FIG. 1 is a sheet of EMI shield material. The shield material sheet comprises a sheet of an impregnating base material and a conductivity-imparting agent applied on the sheet, and the impregnating base material sheet coated with the conductivity-imparting agent is heated and pressed. And a sheet of an electromagnetic wave shielding material (see Japanese Patent Application Laid-Open No. 5-102694).

The sheet of the impregnable base material used therein is a sheet capable of impregnating the vehicle (binder) contained therein when the conductivity-imparting agent applied or printed thereon is heated and pressed. Is preferred. Specific examples thereof include paper, non-woven fabrics, and fabrics such as woven or knitted fabrics, and wood, but non-woven fabrics are particularly preferable, and non-woven fabrics such as nylon, polypropylene, polyester, and natural materials are particularly preferable.

The conductivity-imparting agent to be used is a substance that is impregnated in a base material sheet and imparts conductivity by heating and pressurizing, and examples thereof include a conductive paint, paste, ink and the like. The conductive paint (paste or ink), which is a typical example, contains conductors that have been conventionally used, that is, copper, silver, silver palladium, etc., and as a vehicle agent or binder contained therein. Is a thermoplastic resin, for example, a thermoplastic or thermosetting resin such as a polyacrylic resin, a polyvinyl chloride resin, a polyvinyl acetal resin, a polyurethane resin, or a phenol resin resin.

These conductivity-imparting agents are coated by a known coating method, but a printing method such as screen printing is preferably used. By printing the pattern of the conductor layer, it is possible to freely set a pattern having a portion to be insulated and a portion without other conductor layers.

Also, the background itself of the sheet may have various patterns (patterns), but the punch art pattern or the honeycomb pattern shown in FIG. 5 is particularly preferable. These patterns have the advantage of excellent adhesion to the resin to be laminated because the non-woven fabric is exposed and the white part has excellent adhesiveness. Next, just by screen-printing with a conductivity-imparting agent, the conductivity is still insufficient, so heating and pressurizing this will dramatically improve the conductivity (approximately 1 Decrease the digit resistance value).

The EMI shield material (sheet) 2 and the plastic film (sheet) 1 described above can be separately inserted into an injection molding die, but both are laminated (laminated) in advance and then inserted. Is preferred. In the former case, it is preferable to interpose a known adhesive layer 9 such as a vinyl chloride-based adhesive between the both.

Reference numeral 3 in FIG. 1 denotes an outer layer resin molded body that is integrally formed with the above-described laminated body 5 of 1 and 2 or both by injection molding. As the resin used for the resin molded body 3, any synthetic resin for injection molding can be used, but usually a resin having an appropriate hardness, for example, a polymethylmethacrylate resin, a polycarbonate resin, a polystyrene resin, AS Resins, polyolefin resins, polyphenylene ether resins, etc., ABS resins with high strength, high impact polystyrene resins (HIPS), etc. are used.

In order to improve the adhesiveness between the plastic film (sheet) 1 and the laminated body 5 of the EMI shield material 2 and the adhesiveness between the EMI shield material 2 and the outer layer resin molded body 3, the space between them is improved. It is possible to interpose a known adhesive layer 9 such as a vinyl chloride type or an acrylic type.

As shown in FIGS. 1 to 3, the switch portion 7 provided in the multilayer resin molded body 3 and the pushing portion 8 according to various purposes form a punched space. The part has a structure in which the EMI shield material laminated film 5 is flat or, preferably, the upper part of the film forms a gently curved curved surface on the surface from the back side thereof.

Reference numeral 4 in FIG. 1 denotes an inner layer resin molding. Any material can be used as the material for the inner layer resin molded body 4 as long as it is a resin for injection molding. However, since it exhibits a core material function, it has excellent strength and has an appropriate rigidity, ABS resin, impact-resistant polystyrene resin, polyphenylene ether resin. Resin, glass fiber reinforced resin and the like are preferable.

The inner layer resin molded body 4 is formed by inserting the outer layer resin molded body 3 and the plastic film 1 and the EMI shield material 2 or a laminated body of both, and injection molding. As described above, the molded body 4 has an advantage that it functions as a core material and that bosses, ribs and other protrusions used for joining with other parts can be freely installed.

Next, an example of a method of manufacturing the EMI shield touch switch panel of the present invention will be described. First, the EMI shield material sheet 2 is manufactured by the method described above, and this and the plastic film 1 are laminated with an adhesive to manufacture a laminated body 5.

Next, as shown in FIG. 4, the above-mentioned laminated body 5 is inserted into an injection molding die and the die is set. The laminated body 5 is mounted so as to cover the parting surface of the female die (cavity) 10 of the die, and then the male die (core) 11 pushes the laminated body to set the die and clamp the die. At that time, the pushing portions 7 and 8 of the switch portion or the like are in a so-called push-cut state in which the laminated body 5 directly contacts the female mold surface, and the injection resin does not enter the portion. When the mold is clamped, the molten resin is injected into the mold, and the layered integral molded body 6 (3/1/2) of the outer layer resin molded body 3 and the above 1 and 2 is obtained.

In the present invention, at the time of the first injection, the injection port (gate) 12 of the molten resin is provided in the female mold, and the resin is inserted from the surface side of the laminated body 5 inserted in the mold. The major feature is that oil is ejected. In the above method, it is preferable to preheat the laminated body 5 or the film 1 and the sheet 2 to be inserted at 80 to 150 ° C. for about 20 seconds to 1 minute because further good effects can be obtained.

Next, the layered integrated molded body 6 is fitted into a female mold of another mold, a male mold is set and the mold is clamped, and then a molten resin is injected, and the inner layer resin molded body 4 is integrated with the mold 6. By molding, the target EMI shield touch switch panel is manufactured.

As another method different from the above-mentioned method, instead of the laminated body of 1 and 2, an adhesive is applied to either 1 or 2 and then the both are superposed and inserted. After extrusion molding, the outer layer resin molded body 3 and the layered integrated molded body 6 (3/2) of both 1 and 2 are molded, and then the mold with the molded body is rotated to A method of manufacturing a desired EMI shield touch switch panel by setting a mold (cavity) and injection molding the inner layer resin molded body 4 can also be used. Embodiments of the present invention will be specifically described below with reference to examples.

[0025]

【Example】

A punch art EMI shield material sheet 2 shown in FIG. 5 is applied to a polyester non-woven cloth (Asahi Kasei, Spunbond Y) with copper powder and an acrylic vehicle (Terinoku Ink, Serinol UG Methume) as a conductivity imparting agent ( A copper paste, solid content 50% by weight) is screen-printed twice using a pattern such as an insulating part and a printing pattern whose ground pattern is a punch art pattern. It was manufactured by hot pressing at 0 ° C. and 40 kg / cm ² for 60 minutes. (See JP-A-5-102694, Example 1). After applying a vinyl chloride-based adhesive on the EMI shield material sheet 2, a PET film 1 having a predetermined printing on the back surface was laminated.

Next, as shown in FIG. 4, after the laminated body 5 obtained by the above method is preheated at 100 ° C. for 30 seconds, the parting of the female mold (cavity) of the mold for the EMI shielded touch panel is performed. Attach it to the surface with adhesive tape in a detachable manner, then set the male mold and clamp it, then inject the melted AS resin (Styrac AS767 made by Asahi Kasei) to the outer layer AS resin molded body 3, PET film 1 and EMI. A laminated body portion 6 having a layered integrated structure with the shield material sheet 2 was obtained. Fit the laminated body part 6 into a female mold (cavity) of another mold, set a male mold (core), and clamp the mold. Then, melted ABS resin (Styrac ABS191F manufactured by Asahi Kasei) from the gate on the core side. Under the molding conditions of a resin temperature of 230 ° C., a mold temperature of 40 ° C., and one cycle of 40 seconds, the inner layer ABS resin molded body 4 is injection-molded integrally with the laminated body portion 6 by a Toshiba IS-80AM injection molding machine, and as shown in FIGS. The EMI shield touch switch panel of FIG. 3 having the sectional structure shown in FIG.

[0027]

[Effect of device]

 The EMI shield touch switch panel of the present invention has the following effects. The cross-sectional (laminated) structure is different from the conventional one, and the surface layer is an injection resin layer except for the pushing parts such as switches, so the surface of the resin layer can be decorated with texture, cloth transfer, etc. Also, if the resin is a transparent resin, it is possible to make various designs depending on the purpose, such as a design that makes the best use of printing on the inside. Since the manufacturing method can be largely omitted compared to the conventional manufacturing method, and the work is simple and easy, the cost can be reduced and it can be provided industrially advantageously.

Since there are protrusions such as bosses and ribs on the EMI shield surface, it has become possible to easily, easily and economically provide a complete EMI shield to a touch switch panel, which has been difficult to complete a complete EMI shield in the past. The EMI shield effect is superior to that of the conventional one, and since the EMI shield material sheet is laminated with the outer and inner layer resins, deterioration, peeling, and cracks of the shield material do not easily occur, and the reliability is high. The punch art or honeycomb pattern EMI shield material used in the present invention has good adhesiveness to the resin to be laminated and has high flexibility, and since the conductor pattern can be freely drawn by printing, the shape and structure of the shield surface. Can be freely designed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an EMI shield touch switch panel of the present invention.

FIG. 2 is an enlarged view of part B in FIG.

FIG. 3 is a plan view of an EMI shield touch switch panel of the present invention.

FIG. 4 is a schematic cross-sectional view (A → B → C) for explaining an assembly mode of a mold used to manufacture the EMI shield touch switch panel of the present invention.

FIG. 5 is a schematic cross-sectional view (continuation of FIG. 4, D → E → F) for explaining an assembling mode of a mold used for manufacturing the EMI shield touch switch panel of the present invention.

FIG. 6 is a plan view of a punch art pattern EMI shield material sheet used in the present invention.

[Explanation of symbols]

 1 Plastic Film (Sheet) 2 EMI Shield Material Sheet 3 Outer Layer Resin Molded Body 4 Inner Layer Resin Molded Body 5 Laminated Body of 1 and 2 6 Laminated Body of 3 and 1 and 2 7 Switch Section 8 Other Pushing Area 9 Adhesive Layer 10 Mold female mold (cavity) 11 Mold male mold (core) 12 Gate

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[Procedure amendment]

[Submission date] April 5, 1996

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Scope of utility model registration request

[Correction method] Change

[Correction content]

[Scope of utility model registration request]

Claims (4)

[Scope of utility model registration request] 1. An outer layer resin molding (3) forming a surface layer excluding the pushing portions (7, 8) and the pushing portions (7, 8)
And a plastic film or sheet (1) located inside the (3) except that the
Electromagnetic wave shield material (2) located inside the
An electromagnetic wave shield touch switch panel having a layered integrated structure composed of an inner layer resin molded body (4) located inside the substrate. 2. An outer layer resin molding (3), which has a surface layer excluding the pushed portions (7, 8) and whose surface is decorated or not, and which is located inside the (3). , And a transparent plastic film or sheet (1) having an adhesive layer (9) in a laminated portion with (3), and pressing portions (7, 8) exposed on the surface, and the inside of the (1). And an electromagnetic wave shielding material (2) manufactured by heating and pressurizing an impregnating base material sheet coated with a conductivity-imparting agent, and an inner layer resin molded body (4) positioned inside the (2). An electromagnetic wave shielded touch switch panel having a layered integrated structure including. 3. The electroconductivity imparting agent used for producing the electromagnetic wave shielding material (2) is a conductive metal paste or ink, the application of which is performed by screen printing, and the impregnating base material sheet is a thermoplastic nonwoven fabric. The electromagnetic wave shield touch switch panel according to claim 2. 4. A layered integral structure of (3)-(1)-(2)-(4) is molded (3) and (1) and (2), or (3) and (1). 3. The electromagnetic wave shielded touch switch panel according to claim 1 or 2, which has a layered integral structure formed by inserting any one of the laminate (5) of (2) and (2) into a mold and injection molding (4).