Capacitive Button Assembly With Intermediary Contacts for Stable Detection
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Solution Overview
Problem
Existing capacitive sensing button units face challenges in improving detection accuracy and reliability, particularly in ensuring stable charge detection and effective electrical conduction.
Innovation Solution
The button unit design includes a conductive member between the conductive spring and the insulating member, and a conductive bracket between the conductive spring and the circuit board, enhancing the yield of contact and stability of charge detection, while simplifying the design and machining of the conductive spring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the conductive spring is in direct contact with the insulating member, then the structure is simpler, but the yield of contact is lower and detection stability is poor
Solution Approach 1:
The patent introduces a conductive member as an intermediary component between the conductive spring and the insulating member. This conductive member includes a first conductive portion that contacts the conductive spring and a second conductive portion that contacts the insulating member, thereby improving the yield of contact and detection stability while maintaining reasonable structural complexity
2Device complexity
If the conductive spring is in direct contact with the circuit board, then the electrical conduction path is shorter, but the contact reliability and electrical conduction effectiveness are insufficient
Solution Approach 1:
The patent introduces a conductive bracket as an intermediary component between the conductive spring and the circuit board. The conductive bracket includes a first bracket portion that contacts the conductive spring and a second bracket portion that contacts the circuit board, thereby improving contact reliability and electrical conduction effectiveness while accepting a longer conduction path
3Ease of manufacture
If the conductive spring design is simplified, then the manufacturing is easier, but the contact reliability and electrical conduction effectiveness deteriorate
Solution Approach 1:
The patent segments the electrical conduction system into multiple independent components: the conductive spring, conductive member, and conductive bracket. This allows the conductive spring to be designed and manufactured simply while the other components compensate to ensure contact reliability and electrical conduction effectiveness
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 design improves the reliability of touch detection, enhances user experience by improving the touching feel, and simplifies the design and manufacturing of the conductive spring, leading to increased accuracy and stability of the button unit.
Implementation Method 1
a conductive spring sandwiched between the conductive bracket and the button assembly and in electrical conduction with each of the conductive bracket and the conductive member
Data Source
AI summary
A button unit and an electronic device are provided. The button unit includes a circuit board, a capacitive sensor being provided on the circuit board; a conductive bracket fixed on the circuit board and in electrical conduction with the capacitive sensor; a button assembly movable relative to the conductive bracket and including a conductive member and an insulating member, the conductive member including a first conductive portion, and the insulating member including a touch surface portion covering an outer side of the first conductive portion; and a conductive spring sandwiched between the conductive bracket and the button assembly and in electrical conduction with each of the conductive bracket and the conductive member.