JPH065151A - Manufacture of key sheet with transparent resin key top - Google Patents

Abstract

PURPOSE:To provide a manufacturing method of a key sheet provided with a key top which can freely select the height, the design of a curved surface structure and the like. CONSTITUTION:The upper surface of a glass jig 7 having a recessed part 6 is applied with masking 8, on the area other than the recessed part, while a UV hardening resin 9 is injected into the recessed part, and a translucent key sheet is put on the upper surface of the glass jig. After ultraviolet ray is applied from the under surface of the glass jig, and the glass jig is removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a key sheet with a key top used for a switch section of electronic equipment.

[0002]

2. Description of the Related Art Conventionally, polyethylene film (PET film) or
Thickly printed on a sheet of urethane or the like, or molded the raised portion, or coat it,
In addition, the key top is glued or hardened to create a touch feeling.

[0003]

In the conventional thick printing, it is difficult to form the key tops high,
Also, you can only create a flat top surface. In the case of molding, a resin such as epoxy is used in order to give a soft touch feeling, but with this resin, it takes a long time to cure and a working time is required. Therefore, the key top portion is created in advance and is bonded, but this bonding step is required. In addition, with the coating, it is not possible to perform surface treatment such as roughening the top surface to change the touch.

[0004]

Therefore, according to the present invention, the shape can be freely designed and the variation of the touch feeling can be selected. A UV curable resin is potted on a key sheet to form a key top. Or do
Using a jig such as glass, the UV-curable resin was molded and then bonded to the key sheet at the same time.

[0005]

[Embodiment 1] FIG. 1 shows a first embodiment.

On the printed PET film 1, a UV curable resin 2 of acrylic type, epoxy type, vinyl type, silicone type or the like which is transparent and has good adhesion to a key sheet is potted in a hemispherical shape, and then UV rays are applied. It is manufactured by irradiating and curing. When an acrylic resin is used as the UV curable resin, the hardness can be freely changed from about 20 degrees of A hardness to about 80 degrees of D hardness by selecting the type of acrylic monomer.

[0007]

Second Embodiment FIG. 2 shows a second embodiment.

The UV curable resin 4 is poured into the concave portion of the jig 3 made of transparent glass acrylic resin, silicone rubber or the like having the concave portion in the shape of the key top portion, and the surface thereof is made of urethane type, olefin type, styrene type, vinyl chloride. A thermoplastic elastomer key sheet 5 of a system or the like is attached, ultraviolet rays are irradiated from the glass surface side to cure the UV curable resin, and the UV curable resin is removed from the glass jig to manufacture. By making the inner surface of the concave portion of the jig 3 rough, it is possible to perform a surface treatment with a touch feeling.

[0009]

Third Embodiment FIG. 3 shows a third embodiment.

The upper surface of the glass jig 7 having the concave portion 6 is masked 8 with a double-sided adhesive tape of black polyethylene on the upper surface other than the concave portion, UV curable resin 9 is injected into the concave portion 6, and the upper surface of the glass jig 7 is further covered. A transparent PET film or urethane sheet 10 is placed on the above, and the masking 8 and the UV curable resin 9 are brought into close contact with each other. Then, the UV curable resin 9 is cured by irradiating ultraviolet rays from below the glass jig 7. It is produced by removing it from the glass jig 7. The UV curable resin 9 shrinks slightly when it is cured. Further, when the injection amount is small, bubbles are likely to be generated between the PET film and the urethane sheet 10, and therefore a slightly larger amount is injected so as to overflow. Therefore, the portion overflowing after curing remains as burrs 11 in an uncured state due to masking, and in that case, it is washed off with methanol or the like.

[0011]

Fourth Embodiment FIG. 5 shows a fourth embodiment.

FIG. 5a shows that the surface of the PET film 17 is potted with a UV curable resin 18 in a hemispherical shape, and then is irradiated with ultraviolet rays to be cured. Dot-like potting 1
9 was formed. The surface is the same even if the key top portion is formed by another method, for example, using a glass jig. FIG. 5b shows that UV curable resins 22 and 23 are injected into the glass jig 20 and the glass jig 21, respectively.
A urethane sheet 24 is disposed between both jigs, and ultraviolet rays are irradiated from above and below to cure the UV curable resins 22 and 23 and to bond them to the urethane sheet 24.

[0013]

Comparative Example FIG. 4 shows a comparative example.

The UV curable resin 14 is injected into the concave portion of the glass jig 13 having the concave portion 12, the key sheet 15 is placed on the upper surface thereof, and the lower surface of the lower surface of the glass jig 13 corresponding to the bottom surface of the concave portion 12 is formed. When the UV curable resin was cured by irradiating it with ultraviolet rays from below from the masking 16 on the other surface, a cured burr portion 25 was generated. This is because the distance between the masking portion and the surface of the key sheet becomes long, so that the oblique width of the irradiation light of ultraviolet rays is large and the masking does not work perfectly.

[0015]

As described above, according to the present invention, since the key top using the UV curable resin is prepared, the height and the curved surface shape of the
Alternatively, it is possible to obtain a product having a variety of touch feelings such as roughening the surface. Further, according to the manufacturing method of the present invention, burrs do not occur, and workability and mass productivity are excellent.

[Brief description of drawings]

FIG. 1 is a diagram of a first embodiment showing a manufacturing method by potting.

FIG. 2 is a second embodiment diagram showing a manufacturing method using a glass jig.

FIG. 3 is a diagram of a third embodiment showing a manufacturing method by masking.

FIG. 4 is a diagram showing a comparative example.

FIG. 5 is a diagram of a fourth embodiment.

[Explanation of symbols]

 1 PET film 2 UV curable resin 3 Glass jig 4 UV curable resin 5 Urethane sheet 6 Recess 7 Glass jig 8 Masking 9 UV curable resin 10 PET film 11 Burr 12 Recess 13 Glass jig 14 UV curable resin 15 Key sheet 16 Masking 17 PET film 18 UV curable resin 19 Projection parts 20, 21 Glass jig 22, 23 UV curable resin 24 Urethane sheet 25 Burr

Claims (4)

[Claims] 1. A method for producing a key sheet with a transparent resin key top, which comprises potting a UV curable resin on a PET film and then irradiating it with ultraviolet rays to cure it. 2. U in the recess of a glass jig having a recess
A method for manufacturing a key sheet with a transparent resin key top, in which a V-curable resin is injected, a PET film or a urethane sheet is placed on the upper surface, ultraviolet rays are applied to cure the resin, and then a glass jig is removed. 3. A glass jig having a concave portion is masked on the upper surface other than the concave portion, and a UV curable resin is injected into the concave portion,
A method for manufacturing a key sheet with a transparent resin key top, in which a translucent key sheet is placed on the upper surface of the glass jig, then ultraviolet rays are irradiated from the lower surface of the glass jig, and the glass jig is removed. 4. A method for manufacturing a key sheet with a UV resin key top, wherein a protrusion is formed on the back surface of a transparent UV resin key top with a key sheet by the manufacturing method according to claim 1, claim 2, or claim 3. .