| 摘要 |
PROBLEM TO BE SOLVED: To improve operability when playing games on a mobile phone. SOLUTION: A cross-shaped protrusion 2 is provided on a surface of a belt-shaped member 1. The member 1 is constituted to be attachable to a part of numerical key group of the mobile phone. The cross-shaped protrusion 2 is constituted to cover a key '5' being a center of the numerical key group of the mobile phone with a center thereof, and its four surrounding keys '2' '4' '6' '8' with four end parts thereof. Key operation of the keys '2' '4' '6' '8' is performed through the cross-shaped protrusion 2 with tactile sensation, which is convenient in playing games. COPYRIGHT: (C)2007,JPO&INPIT
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