Dual-Shutter Potential Sensor with Segmented Magnetic Drive
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Solution Overview
Problem
Conventional potential measuring devices have low magnetic efficiency due to small displacement of vibrating pieces and inadequate magnetic field distribution, resulting in weak driving force.
Innovation Solution
A potential measuring device with a configuration that includes a first and second shutter with leaf spring parts, a coil with yokes having opposing magnetic poles, and magnets positioned to enhance magnetic flux flow, allowing for improved magnetic efficiency by alternating magnetic flux direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If magnets and back yoke are disposed only on one end side of the coil, then the structure is simplified, but magnetic efficiency deteriorates and driving force becomes weak
Solution Approach 1:
The patent divides the magnetic field generation into two independent coil units, each with its own magnets and back yoke. This segmentation allows each unit to generate sufficient magnetic flux independently, improving overall magnetic efficiency while maintaining structural simplicity through modular design
Solution Approach 2:
The patent transitions from a single-sided magnet arrangement to a dual-sided configuration where magnets are disposed on both end sides of the coil. This dimensional change in magnetic field distribution doubles the effective magnetic flux generation, significantly enhancing driving force without excessive structural complexity
2Device complexity
If the vibrating piece vibrates in a direction orthogonal to its extending direction, then the structure is simplified, but displacement amount becomes small
Solution Approach 1:
The patent employs a vibration excitation mechanism that dynamically induces lateral vibration of the shutter part. By utilizing resonant vibration frequencies and alternating magnetic forces, the system achieves large displacement amplitudes in the width direction without requiring complex mechanical vibration structures
Solution Approach 2:
The patent explicitly utilizes mechanical vibration of the shutter part in the width direction to modulate the capacitance between the shutter and sensor. By optimizing vibration frequency and amplitude, the system achieves sufficient displacement for accurate potential measurement while maintaining structural simplicity
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 device achieves better magnetic efficiency and driving force, enabling more sensitive and effective measurement of surface potential with reduced device dimensions.
Implementation Method 1
a coil having a yoke in which magnetic poles different from each other are formed on one end side and another end side when an electric current is conducted
Implementation Method 2
when an electric current is conducted through the coil, it is possible to drive a driver in a direction orthogonal to a lining direction of the coil and the magnet
Data Source
AI summary
A potential measuring device which measures a charged object in a non-contact manner with a sensor may include a first shutter having a first shutter part, which is provided with a first opening which can be positioned at a position opposing the sensor, and leaf spring parts extending from both ends thereof; a second shutter having a second shutter part, which is provided with a second opening which can be positioned at a position opposing the sensor and the first opening, and leaf spring parts extending from both ends thereof; a coil provided so that a direction along a center axis opposes portions of the leaf spring parts; and a magnet provided on each of regions opposing both end sides of the coil in the leaf spring parts extending from the both ends of each of the first shutter part and the second shutter part.