| 摘要 |
PROBLEM TO BE SOLVED: To inverse only a dome part positioned directly below the press operation part, and suppress inversion of the other dome parts surely when one depressing operation part of a ring key is pressed in a key input device provided with the ring key having a plurality of depressing operation parts of 3 or more. SOLUTION: In the key input device, a key sheet 5 is installed at the surface of the base plate 3 via a dome sheet 4, and the ring key 13 having the four depressing operation parts 13b, 13c is installed at the surface of the key sheet 5. In the dome sheet 4, the four dome parts 44, 45 swelled toward the depressing operation parts 13b, 13c of the ring key 13 respectively. At the rear face of the key sheet 5, four pushers 54, 55 protruding toward the respective dome parts of the dome sheet 4 are protrudedly installed, and at respective four positions pinched by the two mutually adjacent dome parts, four bosses 62 protruding toward the dome sheet 4 are protrudedly installed. COPYRIGHT: (C)2005,JPO&NCIPI
|
