Keyboard Key Detection Accuracy via Segmented Support
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Solution Overview
Problem
Conventional keyboard devices face issues with inaccurate detection of key-pressing information due to deviations in the initial position and displacement amount of displacement members, leading to reduced detection accuracy.
Innovation Solution
The keyboard device incorporates a configuration where keys are pivotally supported by a chassis, with a displacement member linked to the keys, and a sensor detects key-pressing information through the displacement of a detected part relative to a coil, ensuring precise alignment and engagement of components to maintain accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the holder supporting the displacement member is directly attached to the substrate, then the clearance between the detected part and the coil can be maintained as designed, but the initial position and displacement amount of the displacement member may deviate from design values, reducing detection accuracy
Solution Approach 1:
The support structure is divided into two separate members: a first support member that supports the keys and a second support member that supports the displacement member. The second support member is displaceably connected to the first support member, allowing independent positioning and adjustment. This segmentation enables the clearance between the detected part and coil to be maintained as designed while separately controlling the initial position and displacement amount of the displacement member to match design values, thereby resolving the contradiction between manufacturing precision and measurement precision.
2Measurement precision
If the displacement member is rigidly fixed to maintain position, then alignment is improved, but the ability to detect key-pressing displacement is reduced
Solution Approach 1:
The second support member is designed to be displaceably connected to the first support member, creating a dynamic support system. This displacement connection allows the second support member to move relative to the first support member in response to key pressing forces, thereby maintaining the ability to detect key-pressing displacement. Simultaneously, the displacement connection ensures proper engagement and alignment of components, achieving both high relative positional accuracy and preserved displacement detection capability.
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
This configuration enhances the accuracy of key-pressing information detection by improving the relative positional accuracy between keys and displacement members, allowing for precise engagement and reduced clearance, thereby accurately detecting key-pressing information, including aftertouch performance.
Implementation Method 1
a coil 57 (sensor) generating a magnetic field is formed on a substrate 56 and a metal plate 55 (detected part) facing the coil 57... the current (magnetic field) flowing through the coil 57 changes through relative displacement of the metal plate 55 with respect to the coil 57
Data Source
AI summary
Since a white key 2a and a holder 9 to which the displacement member 8 is pivotally supported are assembled to the same chassis 4, the relative positional accuracy between the white key 2a and the displacement member 8 can be improved. As a result, the guide pin 73 of the linkage member 7 and the groove 80 of the displacement member 8 can be accurately engaged at the position as designed. Therefore, the initial position (angle) of the displacement member 8 before key-pressing and the displacement amount (rotation amount) of the displacement member 8 accompanying key-pressing are more likely to follow the design value. Consequently, the key-pressing information of the white key 2a can be detected with high accuracy.