Keyboard device for an electronic musical instrument

摘要

A keyboard device for an electronic musical instrument made according to the applicant's invention comprises a printed circuit board formed with pairs of stationary contacts corresponding to respective keys and a common movable contact member made of elastic rubber and disposed over the circuit board for connecting each pair stationary contacts. The common movable contact member is used for plural pairs of stationary contacts and on-off condition of each key switch is detected in time division. The movable contact member is simply placed in position on the printed substrate and holding members are provided on a keyboard frame for restricting lateral expansion of the movable contact member which takes place when the movable contact member is brought into contact with the stationary contacts by depression of the keys.