Shielding Member for Magnetic Sensor in Haptic Actuator
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Solution Overview
Problem
The accuracy of position measurement using a magnetic sensor on a pseudo force sensation providing device is compromised by the magnetic field generated by the electric actuator, leading to a larger device size that is difficult to grip with one hand.
Innovation Solution
Incorporating a shielding member between the actuator and the magnetic sensor to block the magnetic field generated by the actuator, allowing for accurate external magnetic field measurement despite a short distance between the components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between the actuator and the magnetic sensor is increased to reduce magnetic field interference, then the measurement accuracy of the external magnetic field is improved, but the device size increases and becomes difficult to grip with one hand
Solution Approach 1:
A shielding member is introduced as an intermediary component between the actuator and the magnetic sensor. This shielding member blocks the magnetic field generated by the actuator from reaching the magnetic sensor, thereby eliminating the need to increase the distance between these components. The device maintains a compact size while achieving accurate external magnetic field measurement.
2Adaptability or versatility
If a magnetic sensor is mounted on a pseudo force sensation providing device with an electric actuator, then the device can measure position using external magnetic fields, but the magnetic field generated by the actuator significantly decreases measurement accuracy
Solution Approach 1:
The shielding member serves as a mediator that allows the magnetic sensor to function accurately despite the presence of the actuator. By blocking the actuator's magnetic field from reaching the sensor, the shielding member enables precise position measurement using external magnetic fields while the actuator operates normally.
Solution Approach 2:
The shielding member is strategically positioned between the actuator and the magnetic sensor to create a localized magnetic field barrier. This localized shielding approach protects the specific region where the magnetic sensor operates, allowing the actuator to generate magnetic fields elsewhere without interfering with measurement accuracy.
3Object-affected harmful factors
If the distance between the actuator and the magnetic sensor is increased, then the magnetic field interference is reduced, but the device becomes too large to be gripped with one hand
Solution Approach 1:
The shielding member acts as a mediator that blocks magnetic field interference without requiring increased distance. This allows the device to maintain a compact, hand-grippable size while effectively eliminating the harmful magnetic field interference from the actuator at the magnetic sensor's location.
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 shielding member effectively blocks magnetic interference, enabling precise external magnetic field measurement and maintaining a compact device size suitable for one-handed use.
Implementation Method 1
a shielding member that is provided between the actuator and the magnetic sensor, and surrounds a portion of the actuator on the side of the magnetic sensor, to block a magnetic field on the side of the magnetic sensor generated by the actuator
Data Source
AI summary
Provided is a pseudo force sensation providing device that can accurately measure an external magnetic field despite a small size thereof. Provided is a pseudo force sensation providing device including: an electrical actuator that performs physical movement based on a control signal supplied thereto; a contact mechanism that performs periodic asymmetric movement that causes a user to perceive pseudo force sensation, based on physical movement of the actuator; a magnetic sensor that measures an external magnetic field; and a shielding member that is provided between the actuator and the magnetic sensor, and surrounds a portion of the actuator on the side of the magnetic sensor, to block a magnetic field on the side of the magnetic sensor generated by the actuator.