Backlit Keycap Groove Etching for Symbol Illumination
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Solution Overview
Problem
Backlit keyboards face challenges in effectively illuminating symbols on keycaps without excessive light leakage, leading to symbols being obscured or overly bright, which affects visibility and user experience.
Innovation Solution
A keycap design featuring a translucent base with a layer of paint and a laser-etched groove that exposes the base underneath, allowing selective light transmission to create a glowing symbol while keeping the rest of the keycap dark, and optionally using a clear paint to fill or partially fill the groove for tactile feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a layer of paint is applied to the translucent keycap base to block light, then the background darkness is improved, but the symbol visibility deteriorates
Solution Approach 1:
The keycap surface is segmented into two functional zones: a painted background area that blocks light to create darkness, and an unpainted symbol area that allows light transmission for visibility. This segmentation resolves the contradiction by spatially separating the light-blocking function from the light-transmitting function.
Solution Approach 2:
Different regions of the keycap are assigned different optical properties: the background area has light-blocking quality due to paint application, while the symbol area maintains light-transmitting quality by removing paint. This local differentiation allows simultaneous achievement of background darkness and symbol visibility.
2Illumination intensity
If the light source emits light across the keycaps, then the symbols are illuminated, but excessive light leakage occurs causing symbols to be overly bright
Solution Approach 1:
The groove depth is controlled to precisely regulate the amount of light transmitted through the symbol area. By adjusting this geometric parameter, the system achieves optimal symbol illumination while preventing excessive light leakage that would cause overly bright symbols.
3Shape
If multiple paint layers are used to achieve desired appearance, then the aesthetic quality is improved, but the manufacturing complexity increases
Solution Approach 1:
The intermediate primer layer is extracted and eliminated from the paint system. The design achieves the desired appearance quality by applying only the necessary functional layers (background paint and clear coat), reducing manufacturing complexity while maintaining aesthetic standards.
4Loss of information
If the groove penetrates completely through the paint layer to expose the base, then symbol visibility is improved, but the keycap structure becomes more complex
Solution Approach 1:
Instead of creating complex lateral patterns or multiple layers to achieve symbol visibility, the solution uses vertical dimensionality by etching grooves that penetrate through the paint layer. This dimensional approach simplifies the overall structure while effectively exposing the translucent base for light transmission.
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 design enhances symbol visibility in dark environments while maintaining a dark background, regulating brightness through groove depth and paint layers to prevent excessive light emission, and reduces paint usage by eliminating intermediate primer layers.
Implementation Method 1
a translucent base having a surface with a layer of paint applied directly onto the surface. The layer of paint is capable of blocking at least some light that passes through the translucent base
Implementation Method 2
A groove is laser-etched on the surface that defines the shape of a symbol. The groove penetrates the layer of paint completely, thus exposing parts of the translucent base that are hidden underneath the layer of paint
Data Source
AI summary
In one aspect, a keycap for use in backlit keyboards is provided. The keycap includes a translucent base having a surface with a layer of paint applied directly onto the surface. The layer of paint is capable of blocking at least some light that passes through the translucent base when the keycap is backlit. A groove is etched on the surface that defines the shape of a symbol. The groove penetrates the layer of paint completely, thus exposing parts of the translucent base that are hidden underneath the layer of paint. Because the translucent base is exposed by the groove, when the keycap is backlit, the symbol may appear to glow while the rest of the keycap's surface may appear to remain dark. The symbol may be a letter, number, or any other symbol one might want to put on a keyboard key.