Patent ID: 8112631

Claim:
A password input device comprising: a detection module configured for detecting angular velocities and accelerations of hand movement; a recognition module comprising: a conversion unit configured for converting the detected angular velocities and accelerations, in analog format, into usable data; a character database; an indexing unit configured for seeking a character corresponding to a user input in the character database according to the usable data and outputting the corresponding character; a timer configured for measuring an idle interval following user input prior to subsequent user input; if a subsequent user input is detected by the detection module, the idle interval is a time interval between the prior user input and subsequent user input; and a determination unit configured for determining whether the idle interval exceeds a predetermined minimum value and is less than a predetermined maximum value, if so, the determination unit outputting a blank character to the output module, if the idle interval exceeds the predetermined maximum value, the determination unit determining that user input is completed and signals the output module to delete the blank characters received after the most recent input; and an output module configured for receiving the corresponding characters from the indexing unit and determining the password.