| 摘要 |
PROBLEM TO BE SOLVED: To provide a protective sheet that is unlikely to be broken even after the use for a long period of time. SOLUTION: The protective sheet 110 has a two-layered structure including a first layer 11 made of, for example, a skin layer and a second layer 12 made of, for example, nonwoven fabric, whereby the durability of the protective sheet during the use for a long period of time and the durability thereof with respect to the keying of a keyboard can be enhanced, compared with a protective sheet with a single-layered structure. Thus, even when the keyboard 5 with the protective sheet 10 placed thereon is depressed repeatedly, the fatigue of the protective sheet 10 is less and the damage thereof caused by breakage can be reduced. The strength of the protective sheet 10 is thus enhanced, which can prevent liquid, dust and the like from entering the reverse side of the key-tops. COPYRIGHT: (C)2011,JPO&INPIT |
