| 摘要 |
PROBLEM TO BE SOLVED: To provide an input device whose operability is improved by preventing operation mistakes. SOLUTION: A corner part (2a) of a "1" button, a corner part (3a) of a "3" button, a corner part (4a) of a "7" button and a corner part (5a) of a "9" button arranged on diagonal lines of a "5" button are formed so as to draw a curve that is more gentle than the corners of "2", "4", "5", "6", "8" and "0" buttons. Concretely, the curvature of the corner parts (2a to 5a) is formed to be larger than the curvature of the corners of the "2", "4", "5", "6", "8" and "0" buttons. COPYRIGHT: (C)2007,JPO&INPIT
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