| 摘要 |
<p>A switch device disposed in a handheld apparatus having a keypad with double function is capable of automatically switching to one function by means of sensing directionality of the apparatus. The handheld apparatus has a keypad whose some keys bear double function. 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 the keypad. The keys with double function are then switched to one function corresponding to the judged direction.</p> |
