Actuator Coil Noise Shielding via Capacitor Density
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Solution Overview
Problem
Actuators with coils face interference from magnetic noise generated by non-connection wiring, leading to characteristic variations and reduced performance.
Innovation Solution
Incorporating capacitors with high volume density of conductors near the coil, connected to ground, to effectively shield noise from non-connection wiring and stabilize the substrate structure, thereby reducing noise interference and characteristic variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If non-connection wiring is disposed near the coil for space saving, then space utilization is improved, but magnetic noise interference increases
Solution Approach 1:
A capacitor is introduced as an intermediary component between the non-connection wiring and the coil. The capacitor's conductive structure acts as a shield that intercepts and redirects magnetic noise from the wiring, preventing it from reaching the coil while allowing the wiring to remain in its space-efficient position near the coil.
Solution Approach 2:
The capacitor structure, which could be considered an added component for noise reduction, actually serves dual purposes: it provides electrical function (decoupling or filtering) and simultaneously acts as a magnetic shield. The harmful magnetic noise is converted into a beneficial shielding effect by the capacitor's conductive plates.
2Object-affected harmful factors
If capacitor is densely located near the coil, then noise shielding effect is improved, but device complexity increases
Solution Approach 1:
The capacitor is designed to perform multiple functions simultaneously: electrical decoupling/filtering and magnetic noise shielding. By placing the capacitor in the first region near the coil, the same component provides both electrical and magnetic protection, eliminating the need for separate shielding structures and reducing overall device complexity.
Solution Approach 2:
The noise shielding function is merged with the electrical capacitor function. The capacitor's conductive structure is positioned and configured to serve as both an electrical component and a magnetic shield, combining two protective functions into a single integrated component.
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 configuration significantly reduces noise interference and stabilizes the actuator's performance by providing effective shielding and structural stiffness, leading to improved reliability and consistency.
Implementation Method 1
when a capacitor with a high volume density of conductors is densely located near the coil (i.e., in the first region of the base substrate), the volume density of the conductors near the coil is increased and this provides effective shielding against noise from the base substrate
Implementation Method 2
an actuator which includes a coil and a base substrate unit including a coil driving circuit for driving the coil. This actuator is configured to move a movable body including a magnet, using a magnetic field generated by the coil
Data Source
AI summary
An actuator includes a coil substrate including a coil, a base substrate including insulating base layers that are stacked, capacitors disposed in the base substrate, and a magnet to receive a magnetic field from the coil. The base substrate includes a coil driving circuit, and a first region closer to the coil and a second region farther from the coil. The first and second regions are defined by two portions of the base substrate divided in a direction in which the insulating base layers are stacked. The capacitors are disposed in the first region more densely than in the second region.