| 摘要 |
PROBLEM TO BE SOLVED: To satisfy tight closure property, legibility and operability and to reduce costs. SOLUTION: A sheet 10 made of light transmissive thermoplastic synthetic resin on the market is used as a substrate, printed layers 11 formed on the surface of the sheet 10 form sheet recessed parts 14 located inside the bottom, and push buttons 4 are produced by filling up synthetic resin in the recessed part 14. Because the contact surface 29 of a case cover 3 and a push button coat 19 is closely adhered when injection molding is performed, the resin is prevented from flowing to the surface 29. Metallic mold does not have to be inserted into the gap 38 between the button 4 and the opening part 8 of the cover 3. Since the gap 38 can be minimized, miniaturization is easily performed and constraint on a design is also reduced.
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