Two-Piece Keyboard Key Cap With Segmented Materials
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Solution Overview
Problem
Existing key assemblies for thin touch keyboards are cumbersome and costly to manufacture, as they require a single piece of material for both the key cap and base, making it difficult to apply paint or ink and limiting design flexibility.
Innovation Solution
A two-piece key assembly is introduced, where the key cap and key base are made from different materials, allowing for separate engineering of material properties, with the key base having high lubricity for sliding engagement and the key cap having a lower lubricity for paint application, and the two pieces connected via snap fit, interference fit, or adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single piece of material is used for both key cap and base, then manufacturing is simpler, but it becomes cumbersome and costly due to masking requirements for paint application and limits design flexibility
Solution Approach 1:
The key assembly is divided into two separate pieces: a key cap made from a first material and a key base made from a second material. This segmentation allows each component to be optimized independently for its specific function, enabling the key cap to have a surface suitable for paint application while the key base has properties suitable for sliding engagement, thereby resolving the contradiction between manufacturing simplicity and design flexibility
Solution Approach 2:
The invention uses different materials for the key cap and key base, creating a composite structure where each material is selected for its specific properties. The key cap uses a material with surface characteristics ideal for paint application and durability, while the key base uses a material optimized for low friction and sliding engagement, thus achieving both ease of manufacture and design flexibility
2Ease of operation
If the key base has high lubricity for sliding engagement, then sliding is facilitated, but paint application and long term usability of the surface becomes difficult
Solution Approach 1:
By separating the key assembly into a key cap and key base, the invention assigns different surface properties to each component. The key base is given high lubricity to facilitate sliding engagement with the PTE feature, while the key cap is given a surface with lower lubricity that is ideal for paint application and provides durable lettering, thus resolving the contradiction between ease of operation and ease of manufacture
Solution Approach 2:
Different parts of the key assembly are given different surface qualities tailored to their specific functions. The key base surface is engineered with high lubricity for optimal sliding performance, while the key cap surface is engineered with properties that facilitate paint adhesion and long-term usability, thereby resolving the contradiction through localized optimization
3Ease of manufacture
If the key cap is made from material with lower lubricity for paint application, then paint adhesion improves, but sliding engagement with the base becomes more difficult
Solution Approach 1:
The invention separates the key cap and key base into distinct components, allowing the key cap to be made from a material with lower lubricity that provides excellent paint adhesion and durable lettering. The sliding engagement function is transferred to the key base, which is made from a material with high lubricity, thus resolving the contradiction between paint adhesion and sliding engagement
Solution Approach 2:
The key cap surface is given local quality characteristics with lower lubricity to maximize paint adhesion and lettering durability, while the key base is given high lubricity characteristics to facilitate sliding engagement. This localized differentiation of surface properties resolves the contradiction between ease of manufacture and ease of operation
Data Source
AI summary
A key assembly is for use in a keyboard of the type including a key guide having a planar translation effecting (PTE) feature. The key assembly includes a key base having a PTE mating feature configured to interact with the PTE feature during a key press, and a key cap configured to be attached to the key base. The key base is made of a first material and the key cap is made of a second material different from the first material. A conductive portion and/or a magnet may be wedged between or secured within the key base or the key cap.