Keyboard Backlight Module for Adjustable Base Plate Length
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Solution Overview
Problem
Conventional backlight modules for keyboards are not compatible with base plates of adjustable length, and their light guide plates have design flaws such as incomplete reflective structures, leading to reduced luminous efficiency and light transmittance.
Innovation Solution
A keyboard design featuring a base plate with elongated slits for adjustable length, combined with a backlight module comprising a shielding sheet, a light guide plate, and a reflecting sheet with slits and elongated openings, where the reflecting sheet is adjusted to match the base plate length and the light guide plate's openings are positioned to concentrate light on key rows, enhancing luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional backlight module is used with a base plate of adjustable length, then the assembly process is simplified, but the backlight module cannot be properly adjusted to match the varying base plate lengths
Solution Approach 1:
The backlight module is divided into separate components: a light guide plate with fixed reflective structures and a reflecting sheet with multiple first slits. This segmentation allows the reflecting sheet to be adjusted independently to match different base plate lengths while the light guide plate remains fixed, resolving the contradiction between adaptability and structural complexity.
Solution Approach 2:
The reflecting sheet is designed with multiple first slits that enable dynamic adjustment of its effective length. By selectively covering or uncovering portions of the reflecting sheet, the backlight module can adapt to different base plate lengths, providing the necessary versatility without requiring a completely reconfigurable structure.
2Ease of manufacture
If dot-shaped reflective structures are formed by ink printing on the light guide plate, then the manufacturing process is simple, but the reflective structures are incomplete with flaws such as missing corners, hollows, or unevenness
Solution Approach 1:
A reflecting sheet is introduced as an intermediary component between the light guide plate and the base plate. The reflecting sheet carries the reflective structures formed by ink printing, isolating the printing process flaws from the light guide plate. This allows the light guide plate to maintain its structural integrity while the reflecting sheet provides the necessary reflective function, compensating for the imperfections in printed reflective structures.
3Adaptability or versatility
If the reflecting sheet is designed without slits for adjustment, then the structure is simpler, but the backlight module cannot adapt to base plates of adjustable length
Solution Approach 1:
The reflecting sheet is segmented with multiple first slits that allow it to be divided into adjustable sections. This segmentation enables the reflecting sheet to adapt to different base plate lengths by selectively activating or deactivating portions of the reflecting surface, providing versatility without requiring a completely complex reconfigurable mechanism.
Solution Approach 2:
The reflecting sheet is designed as a thin, flexible component that can be easily adjusted and repositioned. The inclusion of first slits allows the reflecting sheet to be flexibly configured to match different base plate lengths, providing adaptability while maintaining a relatively simple overall structure compared to rigid, fully reconfigurable systems.
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 allows the backlight module to be applied to base plates of adjustable length and improves light concentration and reflection, thereby increasing luminous efficiency and reducing manufacturing flaws like missing corners or unevenness.
Implementation Method 1
The reflecting sheet comprises a plurality of first slits... the reflective sheet is adjusted and is moved to correspond to the base plate by expansion of the first slits
Data Source
AI summary
A keyboard includes a base plate, a plurality of keys and a backlight module. The base plate has a short-axis direction and a long-axis direction. The keys are disposed on the base plate. The backlight module is disposed on the base plate and includes a shielding sheet, a light guide plate and a reflecting sheet. The light guide plate is disposed on a lower surface of the shielding sheet. The light guide plate includes a plurality of light guide structures corresponding to the keys respectively. Each of the light guide structures includes a ring portion and at least one bend line portion. The bend line portion connects to the ring portion, and the ring portion is formed by a plurality of bending portions. The reflecting sheet is disposed below the light guide plate.