| 摘要 |
PROBLEM TO BE SOLVED: To reduce the deformation of a display part and the cracking of a display layer and to improve a yield and the quality by laminating protective films on a back surface of a display surface. SOLUTION: The reverse text is printed on a polycarbonate film as a base film 1 with a vinyl chloride vinyl acetate-based light shielding black ink, and a display part 2 is printed on the reverse text part with a vinyl chloride vinyl acetate light transmitting color ink to form a display layer 3. The laminating is executed to a side on which the display layer 3 of a PET film coated with acryl adhesive is formed as a protective film 4, to form a laminate film. The laminate film is held by dies for temporary drawing, and a polycarbonate resin is injected to manufacture a sheet-shaped key top forming a key top body 5, whereby the sheet-shaped key top of high quality free from the deformation of the display part and the leakage of light caused by the cracking of the display layer can be provided. As the protective film 4, a polyamide film, a polycarbonate film or a fluororesin may be also used.
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