| 摘要 |
A switch device disposed in a handheld apparatus having double-sided keypad arrangement is capable of automatically switching to enable a keypad on an upward side and disable the downward keypad by means of sensing directionality of the apparatus. The handheld apparatus has a cuboidal housing, whose two opposite sides equip a keypad, respectively. The switch device in the apparatus has a gravity sensor for detecting a distribution of gravity of the apparatus along three coordinate axes. The senor sends a gravity signal to a controller, which judges a direction of the apparatus being disposed. The controller sends a switching signal to a relay connected to the two keypads. The relay controls either of the keypads to be available.
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