Conjoined Key Structure With Pressure Sensing for Touch Accuracy
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Solution Overview
Problem
Conjoined keys in existing technologies suffer from interference between the two keys, making it difficult to accurately determine finger touch actions.
Innovation Solution
A conjoined key structure that includes a support frame with an accommodating groove, first and second piezoelectric transducers, pressure sensors between the transducers, and a key elastically connected to the support frame, allowing for accurate determination of finger touch actions by acquiring data changes in pressing forces and position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two arch-shaped or cymbal-shaped piezoelectric transducers are used to achieve volume increasing and volume decreasing functions, then the conjoined key can control vibration and displacement, but interference occurs between the two keys making it difficult to accurately determine finger touch actions
Solution Approach 1:
The patent divides the conjoined key into two independent modules, each with its own piezoelectric transducer and pressure sensor. The first module handles volume increasing while the second handles volume decreasing, with each module independently detecting touch actions through dedicated pressure sensors. This segmentation eliminates interference between the two keys while maintaining both volume control functions.
2Ease of manufacture
If two piezoelectric transducers are fixed to a key using glue or screws, then the structure can be assembled, but interference between the transducers causes displacement and pressure on the opposite side
Solution Approach 1:
The patent introduces a support frame as an intermediary structure that holds both piezoelectric transducers and pressure sensors. The support frame provides a stable mounting platform that isolates the two transducers from each other, preventing mutual interference while maintaining assembly capability. The frame acts as a mediator that allows both components to coexist without causing displacement or pressure interference.
3Measurement precision
If pressure sensors are added between the piezoelectric transducers to detect touch actions, then finger touch accuracy improves, but the device complexity increases
Solution Approach 1:
The support frame serves multiple functions: it mounts the piezoelectric transducers, holds the pressure sensors, provides structural support, and isolates the components from interference. By making the support frame a multi-functional component, the patent reduces overall device complexity while still achieving accurate finger touch detection through the integrated pressure sensors.
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 addition of pressure sensors between the piezoelectric transducers enhances the recognition accuracy and consistency of finger touch actions, reducing interference between the keys and improving user experience.
Implementation Method 1
arch-shaped or cymbal-shaped upper and lower surfaces are driven to output displacement in a telescopic manner by virtue of an inverse piezoelectric effect of ceramics
Implementation Method 2
due to the piezoelectric effect of ceramic materials, when a force is applied to the key, electromotive potential is generated at two ends of the transducer
Data Source
AI summary
Disclosed are a conjoined key structure and an electronic device. The conjoined key structure includes a support frame with an accommodating groove, a first and second piezoelectric transducers fixedly accommodated in the accommodating groove and spaced from each other, pressure sensors fixedly accommodated in the accommodating groove and located between the first and second piezoelectric transducers, and a key covering the support frame and the accommodating groove. The key and the support frame are elastically connected. Two opposite sides of the first piezoelectric transducer respectively abut against the support frame and the key. Two opposite sides of the second piezoelectric transducer respectively abut against the support frame and the key. Two opposite sides of the pressure sensors respectively abut against the support frame and the key. The conjoined key structure can accurately determine touch actions of fingers, improving the recognition accuracy and consistency of the conjoined key structure.