| 摘要 |
PROBLEM TO BE SOLVED: To easily form a display part on the top or side, to enhance character quality, to efficiently utilize materials and to reduce manufacture costs by printing the display part on a flexible film and by heat fusing and integrally forming the display part using a thermoplastic resin. SOLUTION: To heat fusing and integrally form this flexible film with a thermoplastic resin 10, the flexible film needs excellent secondary processing capability, easy deep-drawing capability, excellent printing processing capability, glossiness and transparency, etc. As for a non-drawn nylon film 6 easily subject to secondary processing such as deep-drawing, nylon films 11 and 12 of low hygroscopic rate of 1% or under are preferably used in order to maintain dimensional stability in integral-forming. On the back side of the non-drawn nylon film 6, a display part such as a light-shielding layer 7 and a light transmissive layer 8, etc., is formed. A key top that consists of the thermoplastic resin 10 is heat fused and integrally formed with a film 9 having the display part deformed in a key top shape.
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