KEY INPUT APPARATUS AND KEY INPUT METHOD OF PORTABLE DEVICE USING OPTICAL SENSOR

摘要

The present invention relates to a key input unit and a key input method of a portable device using an optical sensor, the invention is provided in correspondence with the hole of a predetermined size is provided in place of the button for a plurality of keys constituting the keypad on the portable device (or a keyboard), a plurality of light emitting portion for emitting light through a corresponding hole of a predetermined frequency; Doedoe provided in correspondence with the hole of the multiple key is provided for each light emitting portion and the pair made, when the hole is blocked by a user's key selection corresponding to the light emitted through the light emitting hole in the drive input is reflected to a predetermined voltage level, outputting a signal, if the plurality of light receiving blind hole opened by a user, the hole in the light emitting unit is not emitting light is not input to output the drive stop signal; And to monitor a plurality of light emitting portion and a light receiving portion in a scanning manner, if the predetermined signal output from the predetermined voltage level is detected by the light receiving unit is set to identify the corresponding key on the light receiving portion, and the signal output from the light receiving portion is stopped when the predetermined group in the key selection determines the time of the determination that the signal output of a predetermined voltage level is detected by the other light receiving unit, and set the key to the user selects the candidate key is identified by the judgment, and is set according to the number of selected candidate key The final key to select the user in selecting a candidate key to select the actual controller to deliver to the processor of the portable devices; includes