KEY BASE, KEY SHEET, AND METHOD OF FORMING KEY BASE

摘要

A key base and a key sheet which each can have a reduced thickness. The key base (1) comprises a flexible film sheet (1a) and pushers (1b). The pushers (1b) have been disposed respectively in desired positions. The pushers (1b) are bonded and united to the back of the film sheet (1a) with a material which is not of the heat-curing type. The flexible film sheet (1a) may be, e.g., a thermoplastic urethane film having a thickness of about 0.05 mm. The material which is not of the heat-curing type is a material which is liquid at ordinary temperature and can be cured by a given treatment without heating. This material may be, for example, a UV (ultraviolet)-curable resin, visible-light-curable resin, or electromagnetic-radiation-curable resin.