Keyboard Key Stability via Segmented Pressing Members
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Solution Overview
Problem
Keyboard devices for electronic musical instruments face issues with key stability, as keys may lift or drop under strong impact, and existing solutions either inhibit smooth motion or fail to prevent inclination and wobbling when subjected to strong pressure.
Innovation Solution
A keyboard device design featuring a key pressing member with a rib and sliding portions that engage with a chassis attachment portion, providing uniform force to prevent key lift and stabilize the keys, allowing smooth operation without excessive load or interference with playability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If key guide portions made of hard material are used to prevent key inclination and wobble, then key stability is improved, but abnormal sounds occur and key motion becomes restricted
Solution Approach 1:
The key guide portions are made of a material with low hardness (softer material) rather than hard material, allowing the keys to move smoothly without producing abnormal sounds. This local quality change resolves the contradiction by providing sufficient guidance while maintaining smooth operation.
2Stability of the object's composition
If a pressing plate is used to prevent key lift-up and drop, then key stability is improved, but key motion becomes restricted when rear end portions are pressed strongly
Solution Approach 1:
Instead of using a single pressing plate that contacts the entire rear end portion, the invention divides the pressing function into multiple pressing members, each contacting a specific region. This segmentation allows uniform force distribution while maintaining smooth key motion, resolving the contradiction between stability and operational smoothness.
3Reliability
If keys are merely pressed lightly by a pressing plate to prevent lift-up, then key stability is insufficient under strong impact, but excessive pressing force restricts key motion
Solution Approach 1:
The pressing function is divided into multiple pressing members that contact different regions of the key's rear end portion. This segmentation enables uniform force distribution across the key, providing sufficient stability under strong impact while maintaining smooth key motion without excessive localized pressure.
Solution Approach 2:
The pressing members are positioned to contact only specific regions of the key's rear end portion rather than the entire surface. This partial action provides sufficient pressing force to prevent key drop and inclination under impact while avoiding excessive force that would restrict natural key motion.
Data Source
AI summary
Disclosed is a keyboard device 100, in which a plurality of keys 3 are attached to a keyboard chassis 1 rotatably in a keying direction. In the keyboard device 100, a key pressing member 20 of the keyboard chassis 1 includes sliding portions 26 as protruding parts. Chassis attachment portions 36 of the keys 3 include opening portions 36a as recessed parts. A configuration is adopted so that, in a state where the sliding portions 26 and the opening portions 36a are engaged with other, the keys 3 can be prevented from dropping off from the keyboard chassis 1, and inclination of the keys 3 in a transverse direction can be suppressed.