Polymatech Co., Ltd.

Masaya Katori

Takeshi B Nishimura

Masayuki Kashino

Kengo Nishi

Tedi Kunthady

Toshikazu Yoshioka

Disclosed is a key sheet helping to solve problems caused by a rubber-like elastic material filling dividing grooves. A key sheet is provided with protrusions swelling from the back surface of an operation plate toward dividing grooves. The protrusions, which are formed by a film sheet formed of a thermoplastic resin, can prevent the problems when the rubber-like elastic material filling the dividing grooves are exposed, that is, separation or severance of the rubber-like elastic material. Further, nails or fingertips are not easily allowed to enter the dividing grooves of the operation plate. The protrusions in the grooves formed by the film sheet are not easily worn out through repeated depressing operation, thus realizing a thin and safe key sheet.

Key sheet

A key sheet includes a base sheet and a plurality of key tops arranged on the base sheet and exposed from an operation opening formed in a case of a device. The operation opening has no partition bridge. The base sheet includes a plurality of bases for fixing the key tops and a reinforcing member for supporting the bases while allowing displacement upon pushing.

Key sheets and method of producing the same

The present invention is a key sheet comprising a resin film wherein a mirror-like evaporation deposit layer is provided on a part or all of the back, and further a colored layer is provided at the back of the evaporation deposit layer, said resin film is integrated with the top face side of a button made of resin, allowing to realize a key sheet having all color metallic tones at a low cost, by making the optical concentration of the laminated portion of resin film and evaporation deposit layer 0.35 to 0.85.

A key sheet having a layer and a display section with the sense of the mirror surface is realized at a low cost, in addition, the key sheet which also embodies a illuminating effects is provided. In the key sheet integrated with a film 2 on a surface and a side of a key top body 1 made of a thermoplastic resin, an inorganic substance layer 3 which is 20 to 100 nm in thickness and is 1 to 20% in a transmittance of visible light is formed on the back face of the film.

Key sheet and method for manufacturing the same

A manufacturing method of a keypad for a contact character illumination rubber switch composed of a surface enriched in color design variations is provided. The method includes forming a black or gray intermediate layer (,) on a surface portion of a color keypad member (,) for a contact character illumination switch of the mobile communication system, electric equipment components for cars or the like. A colored surface layer (,) is formed thereon with any color. A laser beam is applied from the upper side thereof for burning up and removing the intermediate layer and the colored surface layer.

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Tokyo, Japan

Masaya Katori