Patent ID: 8389834
Filing Date: 2013-03-05
Classification: G10F,Y10T

Abstract:
1. A key drive device which is to be installed on a keyboard musical instrument configured such that a part of a keyboard is located above a leg block via a key bed and which is configured to drive a plurality of keys of the keyboard in accordance with control signals inputted to the key drive device, comprising: a plurality of drive units each of which includes a plurality of actuators for respectively driving the plurality of keys and a control circuit for controlling operations of the plurality of actuators in accordance with the control signals and each of which is to be installed on the keyboard musical instrument such that at least a part of each of the drive units is inserted into a removal space formed by removing a part of the key bed so as to penetrate therethrough in a vertical direction, wherein, in a state in which the plurality of drive units are installed on the keyboard musical instrument, at least one of the drive units which drives at least one of the keys each of which is located above the leg block includes: (a) a first portion at least a part of which is inserted into an insertion space portion of the removal space defined by and between the leg block and the keyboard and which accommodates the actuators; and (b) a second portion at least a part of which is disposed in other space portion of the removal space except for the insertion space portion and which accommodates the actuators and the control circuit, a dimension of the second portion as measured in at least one of a vertical direction and a horizontal short-side direction being made larger than a dimension of the first portion as measured in the at least one of the vertical direction and the horizontal short-side direction.