Input Device Strain Sensors Multi-Directional Operation
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Solution Overview
Problem
Conventional input devices, such as those described in Patent Document 1, are limited in that they can only accommodate horizontal finger operations and do not allow for pressing operations in multiple directions due to their design, restricting the versatility of user interactions.
Innovation Solution
The earpiece design incorporates a strain-generating body with four strain sensors around a cylindrical portion, secured to a housing, and an operation panel with a shaft inserted into the cylindrical portion, enabling detection of pressing operations in various directions through strain detection, allowing for accurate directional input recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the elastic cap is operated horizontally through an operator's finger, then the operation can be performed in a single direction, but pressing operations against the elastic cap cannot be performed in multiple operational directions
Solution Approach 1:
The input device is segmented into multiple independent operating elements (first elastic cap for horizontal operation, second elastic cap for pressing operation) that can detect different operational directions separately, allowing each element to specialize in a specific type of operation while the system as a whole achieves multi-directional versatility
Solution Approach 2:
The input device achieves multi-functionality by incorporating multiple elastic caps that can detect different types of operations (horizontal sliding and pressing) on the same operation element, enabling a single button structure to support multiple operational modes and directions
2Device complexity
If the detector and operation protrusion are integrally formed in a resin formation body, then the structure is simplified, but pressing operations in multiple directions cannot be detected
Solution Approach 1:
The detection function is segmented into multiple independent strain detection sensors arranged in different orientations around the operation protrusion, with each sensor detecting strain in a specific direction, allowing the integral structure to maintain simplicity while achieving multi-directional detection capability through the coordinated work of multiple sensors
Solution Approach 2:
The input device uses composite material structure combining resin formation body with integrally formed detector and operation protrusion, while incorporating multiple strain detection sensors that can detect strain in different directions, achieving both structural simplicity and multi-directional detection functionality
3Device complexity
If a single strain detection sensor is used, then the device structure is simple, but the accuracy of detecting pressing operations in multiple directions is insufficient
Solution Approach 1:
The detection task is segmented into multiple specialized sensors, each responsible for detecting strain in a specific direction or plane, allowing the system to accurately determine the direction and nature of pressing operations by analyzing the combined output of multiple sensors, thereby achieving high measurement precision through functional segmentation
Solution Approach 2:
The control circuit analyzes the output signals from multiple strain detection sensors to determine the direction and type of operation, using feedback from each sensor to accurately identify pressing operations in multiple directions, enabling precise operational detection through coordinated signal processing
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 user operation detection, preventing malfunctions from non-contact or unintended interactions, such as with hair, and provides a more reliable and versatile input experience by allowing operations in multiple directions.
Implementation Method 1
a detector that includes a strain detection sensor... four strain sensors being secured around the cylindrical portion of the strain-generating body
Data Source
AI summary
An input device includes a housing and a strain-generating body including a cylindrical portion with an upper end surface, the strain-generating body being secured to the housing. The input device includes four strain sensors, the four strain sensors being secured around the cylindrical portion of the strain-generating body. The input device includes an operation panel having a lower surface, the operation panel including a shaft, the shaft being situated on the lower surface and at a central portion of the operation panel, and the shaft being inserted into the cylindrical portion of the strain-generating body to be secured to the strain-generating body. The upper end surface of the cylindrical portion of the strain-generating body and the lower surface of the operation panel are in contact with each other.