Keyboard Key Coil Sensing for Yaw and Roll Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing keyboard devices cannot detect key displacement in the yaw or roll direction during a key pressing stroke, limiting their ability to accurately control sound effects like pitch bend and portamento.
Innovation Solution
An operation detection device with a conductive unit on each key and a substrate equipped with first and second coils, which output signals corresponding to the key's distance, allowing a processor to detect yaw or roll direction displacement during key pressing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a contact type sensor is used to detect key operations, then the key pressing operation can be detected, but the lateral swing (yaw, roll) of the key cannot be detected unless the key is in the key pressing end stage
Solution Approach 1:
The patent replaces contact type sensors with a non-contact type sensor (resonance circuit) that uses electromagnetic fields to detect key position and lateral swing. This substitution allows detection during the entire key pressing stroke, not just at the end stage, resolving the contradiction between measurement precision and ease of operation.
Solution Approach 2:
The patent introduces a resonance circuit as an intermediary detection system that measures key position through electromagnetic resonance rather than direct contact. This intermediary mechanism enables continuous detection of lateral swing throughout the key pressing stroke, overcoming the limitations of contact sensors.
2Measurement precision
If a resonance circuit is used to detect key position and speed, then the position and speed in key pressing direction can be detected, but the lateral swing (displacement in yaw direction or roll direction) of the key cannot be detected
Solution Approach 1:
The patent segments the resonance circuit into multiple independent circuits positioned at different locations on the substrate. Each circuit independently detects lateral swing in specific directions, and the combined data provides comprehensive lateral swing detection. This segmentation approach enables lateral swing detection without requiring a fundamentally different sensor type.
Solution Approach 2:
The patent applies local quality by positioning resonance circuits at specific locations on the substrate to detect lateral swing in particular directions. Each circuit is strategically placed to optimize detection of specific lateral movements, enabling comprehensive lateral swing detection through coordinated local measurements.
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
Enables the detection of key displacement in yaw or roll directions during key pressing, enhancing sound control capabilities by allowing for more nuanced sound expression and effect control.
Implementation Method 1
a sensor comprising at least first and second coils, the sensor being configured to be disposed spaced from one key, among the plurality of keys, so that at least one of the first or second coil outputs a signal corresponding to a distance between the one key and the respective sensor
Data Source
AI summary
An operation detection device for a key operation of a keyboard device includes a conductive unit configured to be disposed on each of keys, a substrate configured to be disposed facing each of the keys in a pressing direction of the keys. The substrate is provided with a sensor including at least first and second coils, the sensor being configured to be disposed spaced from one key so that at least one of the first or second coil outputs a signal corresponding to a distance between the one key and the respective sensor. The operation detection device includes a detection unit configured to detect a displacement of the one key in at least one of a yaw direction or a roll direction based on signals output from the first and second coils during a key pressing stroke of the one key.