Shin-etsu Polymer Co., Ltd.

Mikio Kiyosawa

Sadao Nakano

Susumu Iwama

Takashi Kawamura

Akio Nakamura

Toshihiro Motoki

Noboru Nakafuji

Yoshitsugu Morikawa

Kinji Kuroiwa

Takashi c/o Shin-Etsu Polymer Co Ltd Kawamura

In a push-button switch member provided with a movable contact composed of a metal member constituting a contact surface to contact an opposing electrode, a number of holes are formed in the contact surface in a height direction of the metal member, and the holes are filled with a filler formed of a flexible resin.

Push-button switch-use member and production method therefor

A method for forming a pad character in a key top for a push button switch and a method for manufacturing a cover member for a push button switch capable of permitting a push button switch to be manually operated in a manner comfortable to fingers over an extended period of time while preventing wearing of an indication section and simplifying the manufacturing of the cover member for the push button switch. A pigment particle is coated with a volatilization layer formed of resin blended with an electromagnetic wave absorbing powder to prepare a laser-sensitive color developing agent, which agent is then added to a thermosetting resin or elastomer material to prepare a composition. Each of key tops is formed of the composition, followed by irradiation of a laser beam on each of the key tops to form a character-like or figure-like indication section in the key top.

Method for forming pad character in push button switch and method for manufacturing cover member for push button switch

Disclosed is a novel thermosetting resin composition suitable for the preparation of an integrally molded two-parts composite body consisting of a first part of a cured silicone rubber and a second part of a cured thermosetting resin without intervention of an adhesive layer at the interface. The thermosetting resin composition comprises:

Thermosetting resin composition and two-parts composite body thereof

An improved internally-illuminable push-button switch unit is proposed, which is an assembly comprising:

Internally-illuminable push-button switch unit

A push button switch and methods for manufacturing the same result in increased manufacturing efficiency and increased design freedom. The push button switch includes a key top, a dome section and a leg section which are integrally formed from a silicone rubber material. The key top includes a colored section formed by penetrating the coloring dye of a dye impregnated ink below the upper surface of the key top. The push button switches are formed into a rubber cover configuration by charging a mold for forming a plurality of the push button switches with a silicone rubber material. The dye impregnated ink is then applied onto the surface of each of the key tops by either a wet printing process or a sublimation transfer technique, and is subjected to a heat treatment which causes the dye to penetrate into each of the key tops.

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Nagano-ken, Japan

Mikio Kiyosawa