Keyboard Key Guide Structure for Positional Accuracy
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Solution Overview
Problem
Existing key guide structures in keyboard apparatuses face issues with dimensional stability, positional accuracy, and appearance due to variations in resin molding conditions and aftercontraction, leading to unsmooth key movement, noise, and uneven gaps between keys.
Innovation Solution
A key guide structure featuring a key-side guide member with a convexly-formed portion projecting from the key's inner surface toward the pivot point and a frame-side guide member that allows pivoting while limiting lateral movement, maintaining design accuracy and reducing noise, and minimizing gaps between keys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the key guide is positioned closer to the pivot point to improve positional accuracy of the distal end, then manufacturing precision is improved, but the key guide becomes more difficult to position accurately due to the smaller distance from the pivot point
Solution Approach 1:
The patent transitions from guiding the key directly at its side surface to guiding a separate guide member that is attached to the key. This dimensional separation allows the key guide to be positioned optimally on the frame while the guide member on the key can be positioned at the most suitable location, resolving the contradiction between guiding effectiveness and positioning difficulty.
2Strength
If the opposed side surfaces of the key are made taller to improve structural stability, then strength is improved, but dimensional stability deteriorates due to resin molding variations and aftercontraction
Solution Approach 1:
The patent separates the key structure from the guide function by introducing a dedicated guide member. This segmentation allows the key's side surfaces to be optimized for strength and appearance while the guide member handles the guiding function, eliminating the need for tall side surfaces and thus avoiding dimensional instability from resin molding variations.
3Stability of the object's composition
If a rib is added near the key guide to prevent deformation of side surfaces, then shape stability is improved, but sinkage occurs in the outer surface impairing appearance
Solution Approach 1:
By separating the guiding function into a dedicated guide member, the patent eliminates the need for deformation-preventing ribs on the key's outer surface. The guide member internally supports the side surfaces without creating visible surface features, thus preventing both deformation and sinkage while maintaining aesthetic appearance.
4Ease of operation
If the key guide contacts the inner side surfaces of the key to guide movement, then guiding function is achieved, but unsmooth key movement and noise occur due to dimensional variations
Solution Approach 1:
The patent introduces a guide member as an intermediary between the key and the key guide. This intermediary absorbs dimensional variations and molding inaccuracies, allowing the key guide to maintain consistent contact and provide smooth, reliable guiding without the noise and irregularities caused by direct contact with the key's variable dimensions.
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 solution ensures stable key movement, reduces noise, and enhances the appearance of keys by maintaining positional accuracy and minimizing variations in gaps between keys, while simplifying lubricant application and facilitating easier molding and installation.
Implementation Method 1
slight amount of grease is put between the key guide and the guided portion
Data Source
AI summary
Keyboard apparatus has a frame and a key pivotably mounted on the frame. Key guide structure includes a key-side guide member provided inside the key, and a frame-side guide member provided on the frame. The key-side guide member has at least one convexly-formed portion projecting from the inner surface of a distal end portion of the key, remote from a pivot point of the key, toward the pivot point. The frame-side guide member permits movement of the key-side guide member along a pivoting direction of the key, but limits lateral movement of the key-side guide member.