Keyboard Chassis Rib Design and Key Guide Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional keyboard chassis for electronic pianos face issues with deformation due to high temperatures and noise generation from key and hammer movement, and the key guide structures suffer from material inefficiency and lubricant leakage.
Innovation Solution
A keyboard chassis with reduced vertical ribs and reinforcement ribs, and a key guide structure using soft synthetic resin key guide bodies with plate shape and grooves to prevent noise and material wastage, ensuring stability and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the number of vertical ribs is reduced to decrease material usage, then material efficiency improves, but the rigidity of the keyboard chassis deteriorates
Solution Approach 1:
The patent applies local quality by varying the cross-sectional shape of vertical ribs along their length. The ribs have a thicker section at the upper end and a thinner section at the lower end, concentrating material where rigidity is most needed while reducing material usage where less structural support is required. This resolves the contradiction by optimizing material distribution locally rather than uniformly throughout the structure.
2Stability of the object's composition
If reinforcement ribs are added to maintain rigidity with fewer vertical ribs, then structural stability improves, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple structural elements by integrating reinforcement ribs with the vertical ribs themselves. The reinforcement ribs are formed as continuous structures that connect multiple vertical ribs together, creating a unified stiffening system rather than adding separate, discrete reinforcement components. This reduces device complexity while maintaining structural stability.
3Ease of manufacture
If conventional key guide structures are used with hard synthetic resin, then manufacturing ease improves, but noise generation from key movement increases
Solution Approach 1:
The patent applies composite materials by combining hard synthetic resin for the main key guide structure with soft synthetic resin inserts at the contact points with keys. The hard resin provides structural integrity and ease of manufacturing, while the soft resin inserts reduce noise by providing a cushioning, low-friction contact surface. This composite approach resolves the contradiction between manufacturing ease and noise reduction.
4Ease of operation
If lubricant is applied to key guide surfaces to reduce friction, then ease of operation improves, but lubricant leakage occurs
Solution Approach 1:
The patent uses soft synthetic resin key guide bodies that act as flexible shells covering the key guide surfaces. These soft resin bodies retain lubricant within their structure through capillary action and adhesion, preventing leakage while still providing a smooth, low-friction surface for key movement. The flexible nature of the soft resin allows it to conform to key surfaces while maintaining lubricant retention.
Data Source
AI summary
A keyboard chassis capable of preventing deformation of the keyboard chassis even when the keyboard instrument is stored in an upright position, and a key guide structure capable of stably guiding a key without generating noise. The keyboard chassis is provided with a plurality of connection parts connecting between a rear support part and a front support part. Each connection part includes a plate-shaped vertical rib continuous with the rear support part and the front support part, and a plate-shaped reinforcement rib disposed on an upper end of the vertical rib, with a width increased in the left-right direction. The key guide structure includes key guide holders each having a mounting portion, and key guide bodies each mounted in the mounting portions in a state inserted from above, for being brought into sliding contact with inner side surfaces of a guide recess of each key.