Keyboard Device Elastic Section Delaying Peak Action Load
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional keyboard instruments fail to replicate the key-press feel of an acoustic piano due to the rapid transmission of pressing force and reaction force, resulting in a timing discrepancy in the application of action load.
Innovation Solution
A keyboard device with a rotatable key and hammer member, incorporating an elastic section that is elastically deformed upon key depression, where the relationship between the distance, moment of inertia, and elastic modulus is set to delay the peak action load by a predetermined time, mimicking the key-press feel of an acoustic piano.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the hammer holding section slidably holds the tip end portion of the hammer member to quickly transmit pressing force, then the responsiveness of the key is improved, but the timing of the action load peak cannot be delayed to match acoustic piano characteristics
Solution Approach 1:
The patent introduces a rubber member as an intermediary element between the hammer member and the key. This rubber member with specific elasticity and damping characteristics serves as a mediator that transmits the pressing force while simultaneously delaying the peak action load timing to match acoustic piano characteristics, thus resolving the contradiction between fast response and delayed peak timing
Solution Approach 2:
The patent applies parameter changes by specifying particular elasticity and damping coefficients for the rubber member, and by defining the relationship between the hammer member's moment of inertia and the key's moment of inertia. These parameter adjustments enable the system to achieve both rapid force transmission and delayed peak action load timing
2Ease of operation
If the hammer member rotates to apply action load to the key, then the key-press feel is generated, but the timing of maximum action load does not match the delayed timing characteristic of acoustic pianos
Solution Approach 1:
The rubber member acts as a mediator between the hammer member's rotational motion and the key, providing both the necessary force transmission for key-press feel and the temporal delay for peak action load timing to match acoustic piano characteristics
Solution Approach 2:
The patent employs dynamic characteristics by selecting a rubber member with specific elasticity and damping properties that allow the system to exhibit time-dependent behavior, where the peak action load occurs at a delayed timing while maintaining the key-press feel throughout the depression process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The delayed peak action load timing provides a key-press feel similar to that of an acoustic piano, with the elastic deformation of the keyboard device's components ensuring a temporal delay between 10 msec to 20 msec, enhancing the realism of the key-press experience.
Implementation Method 1
an elastic section provided in at least one of either the hammer member or the key, which is elastically deformed in response to the depression of the key
Data Source
AI summary
A keyboard device configured such that, when L represents a distance in a horizontal direction from a rotation support of a hammer member 3 to a contact point where a key 2 comes into contact with an elastic section 23 of the hammer member 3, I represents a moment of inertia around the rotation support, and K represents an elastic modulus in a vertical direction of the elastic section 23 coming into contact with the key 2, the relationship of L, I and K is set to (2/π)2·K·10−4≦(I/L2)≦4·(2/π)2·K·10−4. Accordingly, when the key 2 is depressed, a timing at which an action load applied to the key 2 by the hammer member 3 reaches its maximum is delayed by 10-20 milliseconds from the start of the depression, whereby the maximum action load can be applied at a timing that gives a key-touch feel close to that of an acoustic piano.