Haptic Input Assembly With Vibration Isolation for Clear Touch Feedback
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Solution Overview
Problem
Existing input assemblies with electromagnetic actuators and resiliently mounted additional masses for haptic feedback suffer from unwanted reverberations that blur the intended sensory impression, requiring a solution to minimize reverberation transmission to the input part while maintaining cost-effectiveness, space efficiency, and durability.
Innovation Solution
An input assembly with a vibration isolator decouples the actuator's additional mass from the input part, using a vibration isolator with a natural frequency greater than the actuator's, and employing damping to reduce reverberations, allowing for precise haptic feedback generation with minimal disruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a resiliently mounted additional mass is used in the actuator to generate haptic feedback, then the haptic effect is reinforced and cost/space are reduced, but reverberations are transmitted to the input part which blur the sensory impression
Solution Approach 1:
A vibration isolator is introduced as an intermediary component between the actuator's additional mass and the input part. This isolator has a natural frequency that is lower than the actuator's excitation frequency, creating a frequency separation that prevents reverberation transmission while allowing the haptic feedback function to operate effectively
Solution Approach 2:
The natural frequency of the vibration isolator is specifically designed to be lower than the actuator's excitation frequency. This parameter change creates a frequency-based isolation effect where the isolator absorbs or blocks the reverberation frequencies from the additional mass while transmitting only the desired haptic feedback signals to the input part
2Object-affected harmful factors
If the natural frequency of the vibration isolator is made lower than the actuator's excitation frequency, then reverberation transmission is reduced, but the isolator's design complexity increases
Solution Approach 1:
The key parameter of the vibration isolator is its natural frequency, which is designed to be lower than the actuator's excitation frequency. This single parameter change achieves reverberation suppression without requiring complex multi-component designs, maintaining simplicity while solving the technical problem
3Manufacturing precision
If damping is applied to reduce reverberations, then the haptic feedback precision is improved, but energy loss increases
Solution Approach 1:
The natural frequency of the vibration isolator is set below the actuator's excitation frequency, creating a frequency-based filtering effect. This approach reduces reverberations through frequency separation rather than heavy damping, thereby maintaining haptic feedback precision while minimizing energy loss compared to high-damping solutions
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 solution effectively reduces reverberations, enabling a haptic feedback that is perceived as precise and brief, with the actuator's excitation frequency falling within the isolation range of the vibration isolator, ensuring the haptic feedback is clear and distinct, meeting the goal of minimal reverberation impact.
Implementation Method 1
using a vibration isolator with a natural frequency greater than the actuator's, and employing damping to reduce reverberations
Implementation Method 2
electromagnetic actuators consisting of an electric coil and an armature cooperating with the magnetic field generated by the coil
Implementation Method 3
employing damping to reduce reverberations
Data Source
AI summary
The invention relates to an input assembly, comprising a carrier, an input part, which is mounted on the carrier in a manner capable of vibrating along at least one direction of movement) by means of mounting means, with an input surface intended to be touched by an operator and with a touch-detection device for detecting a touch upon the input surface by the operator, an electromagnetic actuator for exciting a movement of the input part along the direction of movement by means of an electric control signal in order to generate a haptic feedback for the operator in the case of a touch by the operator, wherein the actuator has a resiliently mounted additional mass and the actuator is attached to the input part via a vibration isolator.