Capacitive Electrode Transmission Shaft for Compact High Sensitivity
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Solution Overview
Problem
Existing capacitive detection microphones suffer from energy loss in the transmission device and frame deformation, leading to reduced sensitivity and potential failure due to the 'pull-in' phenomenon, while attempts to increase sensitivity through displacement or lever arm length compromise compactness and size.
Innovation Solution
An electromechanical system with a rotatably mounted transmission device and movable electrodes secured to transmission shafts, allowing for greater displacement without increasing overall size, using pivot hinges and parallel axes to distribute energy efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the transmission device is made more rigid to reduce energy loss, then sensitivity is improved, but device complexity and risk of pull-in phenomenon increase
Solution Approach 1:
The transmission device is divided into multiple transmission arms (first transmission arms in the first zone, second transmission arms in the second zone) connected by transmission shafts. This segmentation allows the system to achieve the required mechanical coupling while reducing overall complexity and mitigating pull-in risks by distributing the mechanical load across multiple simpler components rather than requiring a single complex rigid structure.
2Measurement precision
If the movable electrode displacement is increased to improve sensitivity, then measurement precision is improved, but the overall device size increases
Solution Approach 1:
The transmission mechanism utilizes rotational movement around a longitudinal axis in addition to the primary displacement direction. The first and second transmission arms rotate around a longitudinal axis of the transmission shaft, converting linear displacement into rotational motion and back. This dimensional transformation allows the movable electrode to achieve greater effective displacement for sensitivity improvement while the overall device footprint remains compact, as the rotational mechanism packs efficiently in three-dimensional space.
3Measurement precision
If the lever arm length is increased to improve sensitivity, then measurement precision is improved, but device complexity and size increase
Solution Approach 1:
The transmission shaft serves multiple functions simultaneously: it acts as the rotational axis for the transmission arms, provides structural support, and enables the coupling between the first and second transmission arms. By merging these functions into a single integrated component, the design achieves the required lever arm length for sensitivity improvement without proportionally increasing device complexity, as the same structural element fulfills multiple mechanical roles.
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 system achieves a better compromise between sensitivity and compactness by minimizing energy loss and preventing 'pull-in' failures, maintaining high sensitivity and reducing overall size.
Implementation Method 1
capacitive detection means 15 disposed in the second zone 12. These capacitive detection means 15 allow measurement of the displacement of the piston 13, and therefore the difference in pressure between its two faces. They preferably comprise a movable electrode 151 and at least one fixed electrode facing the movable electrode 151. The electrodes form armatures of a capacitor whose capacitance varies as a function of the displacement of the piston 13.
Implementation Method 2
The first transmission device 14a being rotatably movable relative to the frame 10 by means of a plurality of first pivot hinges 16a
Implementation Method 3
a plurality of first transmission arms 145a, each of the first transmission arms 145a comprising a first end coupled to a first half of the movable element 13 and a second end secured to the first transmission shaft 144a
Data Source
AI summary
An electromechanical system includes a frame; a movable element; a capacitive measurement or actuation system including a first movable electrode and at least one electrode separated from the first movable electrode by a first dielectric medium; a first transmission device for transmitting movement between the movable element and the first movable electrode, the first transmission device being rotatably movable relative to the frame by a plurality of first pivot hinges; the first transmission device including a first transmission shaft having a first longitudinal axis of rotation; and a plurality of first transmission arms, each of the first transmission arms including a first end coupled to the movable element and a second end secured to the first transmission shaft; the first movable electrode being connected to the first transmission shaft.