| 摘要 |
An operation input device includes a printed circuit board having at least one single push button switch mounted on an upper surface of the printed circuit board, an operation dial supported rotatably about a rotation axis above the printed circuit board, a push button which is rotated at the center of the operation dial integrally with the operation dial and is movable upwardly and downwardly independently, a plate-shaped magnet with at least a pair of magnetic poles evenly and radially divided which is included in the push button and placed on an axis coincident with the rotation axis, and a magnetic-field detection device provided below the push button. When the operation dial is rotated, the magnetic-field detection device for detecting magnetic fluxes from the plate-shaped magnet detects the direction and the amount of rotation.
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