Keyboard apparatus

Abstract

A keyboard apparatus 100 includes plural keys, electronic actuators, reflection plates, and optical sensors. Each of the plural keys extends in the longitudinal direction, and pivots in the vertical direction about a support in accordance with the key depression and key release. Each of the plural electronic actuators has a movable member that displaces in the vertical direction in interlocking with the pivot movement of each of the keys so as to apply a reaction force against the operation of depressing the keys. Each of the plural reflection plates is fixed to the movable member of the electronic actuator, wherein the reflection surface thereof faces in the lateral direction of each of the keys. The light reflectance of each of the reflection plates changes along the displacing direction of the movable member. Each of the plural optical sensors is arranged at the position apart from the longitudinal axis of each of the keys in the lateral direction. It emits light toward the reflection plate and receives the reflected light from the reflection plate so as to output an electric signal according to the quantity of the received light.

Description

technical field [0001] The present invention relates to a keyboard device having a plurality of keys, and more particularly, to a keyboard device having a plurality of electronic actuators that apply a reaction force with respect to a depressing operation of the plurality of keys. Background technique [0002] A natural keyboard musical instrument such as an acoustic piano is configured to produce live sounds, for example, by striking strings with hammers rotated by key depressing operations. Such natural keyboard devices are provided with so-called actuators between hammers and keys as performance operating elements. The player receives a unique reaction force (key damping force) from the key through this actuator. In particular, by setting the actuator, it is possible to obtain the characteristic key touch feeling of a natural keyboard instrument. [0003] On the other hand, in conventional electronic keyboard instruments that produce electronic sounds, such as electroni...

AI Technical Summary

Problems solved by technology

Therefore, if Figure 5A As shown, the following problem occurs: the voltage signal output from the optical sensor 52 is different when the key is pressed and when the key is released, that is, hysteresis occurs.

Due to this hysteresis, even if the plunger 41 is at the same height position, the voltage signal output from the optical sensor 52 is different when the key is pressed and when the key is released, resulting in the inability to determine the plunger from the voltage signal. 41 position problem

A method of correcting hysteresis has been considered, but this method requires complex processing

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