Patent ID: 7602377

Claim:
A method for preventing undesired key depression of a mobile device that has at least three modes, the method comprising: providing a depression preventing mode, the depression preventing mode being a mode in which an operation of the mobile device is not performed even though a corresponding first key of the mobile device is pressed, wherein the mobile device is in the depression preventing mode when the mobile device is a sliding mobile phone in a closed state; providing a half-operation mode, the half-operation mode being a mode in which the operation is automatically performed upon receiving an input from the first key, and the mobile device switches from the half-operation mode to the depression preventing mode when no input is received from the first key or another key within a prescribed time; providing a full-operation mode upon opening of a slide of the sliding mobile phone to an opened position, the full-operation mode being a mode in which the operation is directly performed according to an input from the first key; switching from the full-operation mode to the depression preventing mode in direct response to the slide moving from the opened position to a closed position; and switching from the depression preventing mode to the half-operation mode when a second key is double-clicked, wherein the first key and the second key are a same key, and wherein each of the depression preventing mode, the half-operation mode and the full-operation mode are separate modes.