Keyobard music instrument for producing tone and hammer sensor for stimulating physical parameter of hammer

Abstract

A hammer sensor includes a photo-filter plate movable together with a hammer assembly and having a base plate fixed to the hammer shank and an arc pattern formed on the base plate and different in transparency from the base plate, a photo radiating element radiating a light beam toward the arc pattern and a photo detecting element disposed on the optical path of the light beam for converting the amount of transmitted light to an electric signal, wherein the photo-filter plate converts the rotational angle of the hammer assembly to the amount of light incident on the photo detecting element, and makes the photo radiating element and the photo detecting element stationary so that a suitable photo-shield case prevents the photo elements from environmental light.

Description

technical field

[0001] The present invention relates to a keyboard musical instrument, and more particularly, to a keyboard musical instrument equipped with hammers, for example, an automatic player piano and a silent piano, and a hammer sensor applied thereto. Background technique

[0002] The player piano is a synthetic keyboard musical instrument based on an acoustic piano, a row of solenoid-controlled key drivers and a row of key sensors are provided corresponding to the keys, and an electronic control system is linked to the solenoid-controlled Key drive device array and key sensor array, when a player plays a tune on the keys, the black keys and white keys are respectively depressed by the player, and the associated key sensors report the key movement to the electronic control system . The electronic control system determines which black / white key is depressed and which is released, and determines the duration for which the black / white key...

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