FIELD: physics.
SUBSTANCE: invention relates to devices for inputting information by means of perception of change in light intensity instead of traditional input method by pressing. Such result is achieved due to that input device contains at least one key position (110) and control and reading circuit (120). Each key position (110) is provided with light-transmitting window (111) and photosensitive device (112) on it, wherein light-transmitting window (111) is used to fall external light, wherein photosensitive device (112) is provided on the light path behind light-transmitting window (111), wherein the state of the photosensitive device corresponds to the intensity of the incident external light. Control and reading circuit (120) is used for resetting and scanning each photosensitive device (112), as well as for dispensing - in accordance with the scanned state of each photosensitive device (112) - a key signal indicating whether the corresponding light-transmitting window (111) is closed.
EFFECT: technical result consists in providing higher response rate, without requiring pressing with fingers, which reduces load on fingers and reduces requirements for accurate coordinated finger movements.
12 cl, 7 dwg
