JPH065150A - Manufacture of silicone key switch with resin key top - Google Patents

Abstract

PURPOSE:To shorten the working time, and to improve complexity of the work by carrying out short wavelength ultraviolet ray or plasma discharging process on the surface of a silicone key sheet, and by carrying out a treatment for providing the surface with hydroxyl group. CONSTITUTION:A hydroxyl group is applied in quantity on the surface of a silicone key sheet 1 which is molded and processed into the shape of a key switch, by irradiating the surface with strong short wavelength ultraviolet ray, and a coupling agent 2 of aminopropyl trimellitoxisilane is immediately applied to the surface thinly with a glass stick. After it is dried, a UV hardening resin 3 is mounted into a semispheric shape, and then an ultraviolet ray B for hardening is applied to harden and bond the resin to the sheet. The adhesiveness between the resin key top and the silicone key sheet is thus improved, and the durability of a switch is also improved.

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 resin key top used for a switch section of electronic equipment.

[0002]

2. Description of the Related Art Conventionally, a key top formed by molding with acrylic, ABS or the like is adhered to a silicone rubber or a contact rubber which has been formed and printed in advance by a silicone adhesive.

[0003]

In a key sheet in which a large number of key tops are arranged, if the resin key tops are adhered one by one, the work becomes complicated and the work time is required.

[0004]

According to the present invention, the key top portion is formed of a UV curable resin so that the working time can be shortened. For that purpose, the surface of the silicone key sheet molded into various shapes is irradiated with short wavelength ultraviolet rays or plasma discharge treatment, so that the surface is treated so as to have a large number of hydroxyl groups, and then a UV curable resin as a material for the key top portion is added. A silicone silane coupling agent such as aminopropyltriethoxylane, vinyltriethoxysilane, or mercaptopropyltrimethoxysilane that reacts with a large number of hydroxyl groups attached by the surface treatment to improve the adhesiveness of the stock solution, or Appropriately diluted with a solvent is applied on the surface, and UV-curable resin that cures with acrylic, epoxy, or silicone UV rays is thinly flattened and heaped into any shape such as a hemisphere or a complicated curved surface. After that, irradiate it with ultraviolet rays to cure and bond it, and the silicone switch with resin key top It was to be manufactured.

[0005]

First Embodiment The present invention will be described with reference to the embodiments shown in the drawings.

On the surface of the silicone key sheet 1 molded into a key switch shape, strong short-wavelength ultraviolet light A, and any short wavelength UV light may be used as long as it has an effect of breaking a chemical bond of an organic substance. 185 nm that decomposes ozone to generate ozone, and 25 that decomposes ozone
It is desirable to combine with ultraviolet rays near 0 nm, and the surface is irradiated with this ultraviolet rays to attach a large amount of hydroxyl groups to the surface,
Immediately apply a thin coating of coupling agent 2 of aminopropyltrimethoxysilane with a glass rod, leave it for about 1 minute to dry, and then use a UV curable resin (ThreeBond 300
3) 3 was raised in a hemispherical shape and then irradiated with a curing ultraviolet ray B having a wavelength of about 365 nm to cure and bond it.

[0007]

Example 2 A silicone key sheet molded into a key switch shape was subjected to corona discharge treatment, coated with methacryloxytrimethoxysilane, and then treated in the same manner as in Example 1 to manufacture.

[0008]

According to the manufacturing method of the present invention, the molding and the bonding of the keytop resin can be performed at the same time, so that the working time can be shortened and the working complexity can be greatly improved. Also, the surface of the silicone key sheet is treated with short-wavelength ultraviolet light or plasma discharge, and the surface of the silicone key sheet is processed to give hydroxyl groups, which improves the adhesiveness between the resin key top and the silicone key sheet. Has greatly increased.

[Brief description of drawings]

FIG. 1 is a sectional view of a silicone key sheet.

FIG. 2 is a sectional view of a silicone key switch.

[Explanation of symbols]

 1 Silicone key sheet 2 Coupling agent 3 UV curable resin A Short wavelength UV B UV for curing

Claims (2)

[Claims] 1. A surface of a silicone key sheet, which is optionally molded, is irradiated with short-wavelength ultraviolet light to break the chemical bond of an organic substance, and then a silicone compound that reacts with a hydroxyl group is applied. A method for manufacturing a silicone switch with a resin key top, in which a UV curable resin is piled up in an arbitrary shape on top of it, and ultraviolet rays are applied from above to cure and bond it. 2. A surface of a silicone key sheet, which has been molded as required, is subjected to a surface treatment by plasma discharge, and a UV curable resin is further swelled in an arbitrary shape, and ultraviolet rays are irradiated from above. A method of manufacturing a silicone switch with resin key top that irradiates it to cure and to bond it.