JP2949182B2 - Method of manufacturing cover member for hard illuminated push button switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention is a method of manufacturing a hard illuminated pushbutton switch cover member, in particular has a light transparently section drilled in the predetermined shape on the key top part top, colored light shielding layer is worn The present invention relates to a method for manufacturing a cover member for a hard illuminated push button switch in which a key top portion has a hard feeling without peeling or contamination.

[0002]

2. Description of the Related Art Illuminated push-button switch covers are provided with characters, symbols, pictures ,
In so that visible even in sign dark like shape, a light source placed under side of the cover member for push button switch, is the light
Those configured to reach the light transmitting section provided with the above-mentioned reference numerals are widely used .

[0003] The illuminated push button switch cover member,
As shown in FIG. 3A, diene synthetic rubbers such as natural rubber, polybutadiene, polyisoprene, styrene-butadiene rubber, and neoprene, ethylene-propylene-based, urethane-based, polyester-based, and silicone-based Made from synthetic rubber or thermoplastic elastomers, thermoplastics or combinations thereof,
Key top part 22, thin part 23, base part 24, conductive contact part
On the surface of the push button switch cover substrate 21 made of 25, provided with a colored layer 27 made of light-shielding ink or paint, key
As shown in FIG. 3B, the cover portion shown in FIG. 3A has the light transmitting portion 26 formed on the colored layer 27 above the top portion 22 .
As shown in FIG. 3 (c), a light-transmitting colored layer 28 is provided on the key top portion 22 and is covered with a colored layer 27 having a light transmitting portion 26 . (B) cover
In member, a light-transmitting protective layer 29 on the transparent colored layer 28 is provided, such as was coated with <br/> colored layer 27 is known which has a light transmitting portion 26 from above.

[0004]

[SUMMARY OF THE INVENTION However, in the cover member for an illuminated push button switch of this type, colored light shielding layer 27 made of light-shielding ink or paint, or worn while being used, the tip which pointed, for example I the tip or blade of the cutter of the mechanical pencil per, and torn or spalling, Ri disadvantage there that shielding is lost, also called aesthetic dirty during use is lost There are also problems.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a process for the preparation of such a disadvantage, to solve the problems hard illuminated pushbutton switch cover member, issued according to the claim 1
Ming is at least one surface of the transparent hard plastic layer
To, by coating or primer subjected to (1) corona discharge treatment, after modifying the surface, or applying a silicone adhesive to the modified surface, containing (2) primer silico
After applying the over emissions based adhesive, which is characterized that you integrally bonded to the coated surface to the colored light-shielding layer of the key top portion top surface of the cover substrate for push button switches, engaging in claim 2
That invention contains facilities in surface was reformed in or primer, a corona discharge treatment on one surface of the silicone-based resin layer sheet
On the surface of the Ricoh emissions based resin layer, non-silicone and the adhesive is applied, after bonding the fluoroscopic resistant hard plastic layer here, the key top of another surface of the cover substrate for push button switches of the silicone-based resin layer It is characterized by being integrally bonded to the colored light shielding layer on the top surface.

The present inventors have conducted various studies on methods for preventing the abrasion, peeling and contamination of the colored light shielding layer in the cover member for an illuminated push button switch. By providing a see-through hard plastic layer (hereinafter simply referred to as a plastic layer) as an abrasion resistance improving layer on the colored light-shielding layer on the top surface of the key top portion , these disadvantages and problems can be solved. Find and color this plastic layer with the colored shading layer
A silicone-based adhesive or silicone-based resin may be used to adhere to the surface, but it has been confirmed that the treated surface of the plastic layer or silicone-based resin layer must be surface-modified by corona discharge treatment or the like. Thus, the present invention has been completed. This will be described in more detail below.

[0007]

SUMMARY OF] The hard illuminated pushbutton switch cover member obtained by the invention, protection key top portion top surface of the colored light-shielding layer is protected by a plastic layer Tei Runode, the colored light-shielding layer is worn, peeled, from contamination addition to being, Ri Do what this top having a sense of hard, also, is easily hard illuminated pushbutton switch cover member of interest according to the manufacturing method,
And it can be obtained at low cost.

[0008] The cover member for the hard illuminated push button switch
Surface of the push button switch cover substrate for illuminating the, particularly but colored light shielding layer on the key top part top are provided, the colored light-shielding layer may be those conventionally used, therefore this is a transparent or translucent Natural rubber or polybutadiene, polyisoprene, styrene-butadiene-based rubber, diene-based synthetic rubber such as neoprene, ethylene-propylene-based, urethane-based, polyester-based, on the entire surface of the transparent push button switch cover member or on the surface of the key top portion It is provided by applying a light-shielding ink or paint made of synthetic rubber such as silicone or polyurethane, acrylic, polyimide, polyester resin, or a combination thereof, preferably the same material as the key top portion. .

[0009] The colored light-shielding layer, particularly a plastic layer is provided on the colored light-shielding layer on the key top part top, polyalkyl methacrylate sheet, such as methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate which a main material, acrylate, vinyl acetate, vinyl chloride, styrene, acrylonitrile, methacrylonitrile homopolymers such as nitrile, and the like copolymer, desired shape which does not impair the visibility of the sign of the optical transparently section, for example rather I if those formed into a sheet, this thickness is sufficient to approximately 0.2~3.0mm so as not to impair the visibility, preferably selected of among 0.3~2.0mm this if thickness (appropriately selected depending on the hardness in the material), designed specifically to be, also Also the quality functional (finger touch) can be suitable. Note that this plastic layer may be colored with an appropriate color.

[0010] The plastic layer is provided on the colored light-shielding layer of the illuminated pushbutton switch cover member, durability, electric properties, Ru with silicone adhesive and a viewpoint of translucency
Is preferred. The silicone-based adhesive may be composed of organopolysiloxane, polyacryloxyalkylalkoxysilane-based silicone resin, polyvinylsilane-based silicone resin, polysilthione, polysilazane, a carbon polymer having a silicon-containing side chain, polysilane, or the like. However, this includes, for example, silicone resin KR
166, KR168, KR262, KR2038, KR-101-10
[Both Shin-Etsu Chemical Co., trade name and the like et <br/> be.

[0011] However, this silicone-based adhesive silicon
Since it is not always good adhesiveness to the plastic material other than over down resin, the plastic layer is either corona discharge treatment in advance the surface prior to bonding with a silicone-based adhesive, or by applying a primer to the surface surface it is preferable to keep reforming can be adhered sufficiently strong this ensures a silicone-based <br/> adhesive.

[0012] Therefore, in the production of rigid illuminated pushbutton switch cover member of the present invention, or corona discharge treatment at least one surface of the plastic layer to an extent which is not impairing the translucency, on at least one surface of the plastic layer After applying a primer so as not to impair the translucency and modifying the surface, a silicone adhesive is applied to the modified surface, and this coating is applied.
The fabric face was adhered to the colored light-shielding layer of the key top portion top surface of the cover substrate for push button switches, then if vulcanized optionally the silicone-based adhesive, plastic layer is bonded to the key top portion top Further , the cover member for the hard illuminated push button switch shown in FIG. 1 can be obtained.

[0013] FIG. 1 illustrates an example of a hard illuminated pushbutton switch cover member according to the invention in longitudinal section, which is the key top portion 2, the thin portion 3, the base portion 4, a conductive contact unit 5 become illuminated pushbutton switch cover substrate 1, the translucent colored layer 6 on the top surface of the key top portion 2 is provided, or on its
Cover the surface of the cover substrate 1 with a colored light-shielding layer 7 ,
Coloring of the top surface of the key top part 2 after providing the cutting symbol a in the part
On the light shielding layer 7, in which the plastic layer 8 having <br/> a modified surface by corona discharge treatment on the lower surface, and allowed to contact <br/> wearing silicone adhesive 10. Since colored light shielding layer 7 of the cover member is key top portion top is protected by a plastic layer 8, which without peeling or abrasion, in addition to also eliminate polluting, this top having a feeling hard There is an advantage that it becomes something .

Further , corona discharge to the plastic layer
Instead of treatment, place the primer on one surface of the plastic layer
Apply evenly to the primer and apply silicone
Apply adhesive and press the key
Adhesive and integrated with the colored light-shielding layer on the top surface of the
Mold or apply primer to silicone adhesive
Add it to the plastic layer and apply it to the cover for the pushbutton switch.
ー Adhesive integration with the colored light shielding layer on the top of the key top part of the base material
Then, if necessary, a vulcanization molding method may be used.

[0015] In the manufacture of another hard illuminated pushbutton switch cover member of the present invention, the surface was reformed by performing co <br/> corona discharge treatment on one surface of the silicone-based resin layer, or a primer
On the surface of the silicone-based resin layer containing a non-silicone adhesive, for example melamine, phenolic, epoxy, polyester, polyethylene, polyisocyanate, polyurethane, acrylic, polyamide,
Vinyl acetate - by applying an adhesive such as vinyl chloride, here after bonding the plastic layer, a colored light shielding layer of the key top portion top surface of the unmodified surface of the cover substrate for push button switches of the silicone-based resin layer bonding integrated with, may be vulcanized as needed, thereby those shown in FIG. 2 is obtained, et al.

[0016] Figure 2 shows the hard illuminated pushbutton switch cover member made of use <br/> that have how non-silicone based adhesive described above in longitudinal section, this cover member is key Top section 2, the thin portion 3, the base portion 4, a conductive contact unit 5
Becomes illuminated pushbutton switch cover substrate 1, the translucent colored layer 6 on the top surface of the key top portion 2 is provided, the cover thereon
The entire surface of the substrate 1 is covered with the colored light-shielding layer 7, and
After the symbol a is provided, the colored light-shielding layer 7
A plastic layer 8 and a silicone resin layer 12 having a modified surface subjected to corona discharge treatment, and a non-silicone adhesive
What it is bonded in 11, non-modified silicone resin layer 12
Which was bonded and integrated with quality surface, to exhibit the same effect as that shown in FIG. 1 has been confirmed.

[0017]

Next, examples of the present invention will be described. Example 1 Peroxide vulcanization type silicone rubber, KE-98VBS (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.) 100 parts by weight of vulcanizing agent C-8
The same before the silicone rubber composition was added 0.7 part by weight was inserted into the mold, the molding temperature of 180 ° C., a pressure 200 kg / cm ^2, compression molding to cover the substrate for push button switches with the proviso that the molding time of 7 minutes A black colored light-shielding layer made of silicone-based paint is applied to the outer surface to a thickness of 50 μm, and the top surface of the key top is irradiated with a YAG laser beam to partially remove the light-shielding layer , and then punched out here. to form a code a, made illuminated pushbutton switch cover substrate.

[0018] On the other hand, after the thickness was subjected to corona discharge treatment treated surface on one surface of the transparent polycarbonate sheet width 0.2mm is 400 mm, the silicone-based adhesives, on the treated surface KE-1934A / B [the pre 50/50 parts by printing or coating with a thickness of 20μm by using a 60 mesh version of the key top portion top of the coated surface <br/> was obtained by the above illuminated pushbutton switch cover substrate is bonded to the colored light-shielding layer of the surface, which 140 ° C., a pressure 100 kg / cm ^2, heating and pressing under the conditions that the time 5 minutes, when curing the silicone based adhesive agent layer, a transparent polycarbonate sheet key top portion heaven Although bonding integrated hard illuminated pushbutton switch cover member in the colored light-shielding layer of the surface is obtained, this is the good abrasion resistance since there are polycarbonate sheets, colored light-shielding layer is peeled off, Without contamination It was assumed that the top surface has a sense of hard.

Example 2 A silicone adhesive, KE-1934A /, was coated on a polyethylene terephthalate sheet having a width of 900 mm, a thickness of 50 μm, and a length of 1,000 m.
B by applying a (supra) to a thickness of 100μm using a fountain coater to form a silicone resin layer, and a corona discharge treatment reformed in the table surface, non-silicone-based adhesive to the treated surface Polyacrylic resin adhesive SC-
4625 [Sony Chemical Co., Ltd. product name] is applied with an 80 mesh gravure roll at an amount of 25 g / m ² and a thickness of 0.2 g
A transparent polycarbonate sheet having a thickness of 400 mm and a width of 400 mm was laminated . Next, peel off the polyethylene terephthalate sheet.
Away, the unmodified surface of the silicone-based resin layer, adhered to the colored light-shielding layer of the key top portion top of the fabricated illuminated pushbutton switch cover substrate in Example 1, the same pressurizing and heating conditions as in Example 1 in was molded, transparent polycarbonate sheet layer is found arranged in a key-top ceiling, the same JP to that of example 1
Thus, a cover member for a hard illuminated push button switch exhibiting the property was obtained.

Example 3 Primer KBM-403 [Shin-Etsu Chemical Co., Ltd.] was applied to the surface of a transparent polycarbonate sheet having a thickness of 0.2 mm and a width of 400 mm.
Product name] using a gravure roll in an amount of 30 g / m ² and then printing a silicone adhesive, KE-1934A / B (described above), to a thickness of 20 μm using a 60-mesh plate. · coated, the coated surface is bonded to the colored light-shielding layer of the key top portion top surface of the obtained in illuminated pushbutton switch cover substrate above,
This 140 ° C., a pressure 100 kg / cm ^2, heating and pressing under the conditions that the time 5 minutes, when curing the silicone based adhesive agent layer, a transparent polycarbonate sheet key top top of
A cover member for a hard illuminated push button switch was obtained, which was bonded and integrated with the colored light-shielding layer, but the cover member had good abrasion resistance because the polycarbonate sheet was present on the top surface, and the colored light-shielding layer was peeled off. , Without being polluted
Furthermore, the top surface became hard.

Example 4 A silicone-based adhesive, KE-19, was placed on a polyethylene terephthalate sheet having a thickness of 50 μm, a width of 400 mm and a winding of 1,000 mm.
Primer K at 50 parts by weight / 50 parts by weight of 34A / B (described above)
BM-403 (supra) was obtained by adding 2 parts by weight, plastics by coating to a thickness of 100μm using a fountain coater
After forming the timer-containing silicone resin layer, the table
80 on the surface with polyacrylic resin adhesive SC-4625 (shown above)
It was applied in an amount of 25 g / m ² in mesh gravure roll, this thickness 0.2mm to <br/>, laminated with transparent polycarbonate sheet width 400 mm. Next, polyethylene terephthalate
The sheet is peeled off, and the primer-containing silicone resin layer
And adhered to the colored light-shielding layer of the key top portion top surface of the illuminated pushbutton switch cover substrate, was formed in the same pressurizing and heating conditions as in Example 1, the hard illuminated pushbutton switch cover member was obtained However, this cover member had the same abrasion resistance and finger feel as in Examples 1 to 3.

[0022]

According to the cover member for a hard illuminated push button switch obtained by the present invention, the colored light shielding layer on the top surface of the key top portion is protected by the plastic layer as the wear resistance improving layer. worn or peeled off pollution
In addition to also no longer be or, effect there Ru that its top surface is one with a sense of hard.

[Brief description of the drawings]

1 is a longitudinal sectional view of an example of the present invention thus obtained hard illuminated with the cover member for push button switch.

2 is a longitudinal sectional view of another example of the present invention thus obtained hard illuminated with the cover member for push button switch.

FIGS. 3A, 3B and 3C are longitudinal sectional views showing different aspects of a conventional illuminated push button switch cover member.

[Explanation of symbols]

1,21: Cover member for illuminated push button switch, 2,22 ... Key top part, 3,23 ... Thin part, 4,24 ... Base part, 5,25 ... Conductive contact part, 6,28 ... Translucent Colored layer, 7, 27: colored light shielding layer, 8: plastic layer, 10: silicone adhesive, 11: non-silicone adhesive, 12: silicone resin layer, 26: light transmitting part, 29: transparent Optical protection layer , a ...
issue.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-116719 (JP, A) JP-A-5-282956 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01H 11/00-11/06 H01H 13/00-13/76

Claims (2)

(57) [Claims] On at least one surface of 1. A fluoroscopic resistant hard plastic layer, the (1) by applying or primers subjected to a corona discharge treatment, after modifying the surface, silicone adhesive to the modified surface Or apply (2) primer containing primer
After applying the recone based adhesive, hard quality illuminated pushbutton switch cover member characterized that you integrally bonded to the coated surface to the colored light-shielding layer of the key top portion top surface of the push button switch cover substrate Manufacturing method. 2. With facilities corona discharge treatment on one surface of the silicone-based resin layer containing reformed by surface or primer,
On the surface of the silicone-based resin layer, non-silicone and the adhesive is applied, where after bonding the fluoroscopic resistant hard plastic layer, the key top portion of another surface of the cover substrate for push button switches of the silicone-based resin layer Adhesive integrated with top colored light-shielding layer
Method for producing a hard substance illuminated pushbutton switch cover member said to Rukoto.