KEYBOARD FOR DETECTING A NUMBER OF KEYS INPUTTED CONCURRENTLY

摘要

A keyboard capable of recognizing the simultaneous input of plural keys is provided to prevent the ghost key phenomenon by using a membrane keyboard film unit and a plurality of rectification elements. In a pair of membrane films, a keyboard matrix(80) is formed. A plurality of membrane film unit ports are connected to the keyboard matrix. A PCB port is connected to the membrane film unit port. A keyboard controller(83) outputs a key input sensing signal to the keyboard matrix, and determines an key which a user inputs. A plurality of rectification elements are arranged between the PCB port and keyboard controller. An input port(Port A) receives a signal delivered from the keyboard matrix.