EMP Actuator Housing for Localized Haptic Feedback
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Solution Overview
Problem
Existing electronic devices lack effective localized haptic feedback mechanisms that allow users to receive tactile and audio cues directly on the back panel, limiting the user experience in terms of feedback and interaction.
Innovation Solution
The integration of multilayer electromechanical polymer (EMP) actuators on the interior-facing surface of a mobile device's housing, specifically at thinned or embossed locations, which create localized haptic responses and audio signals when excited, allowing for direct finger feedback and pressure sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If EMP actuators are integrated on the interior-facing surface of the housing, then localized haptic feedback and audio signals are enabled, but the device structure becomes more complex
Solution Approach 1:
The patent combines multiple functions into the housing structure: the housing serves as both structural support and as a mounting surface for EMP actuators, while also acting as a sound transmission path. This merging reduces the need for separate components and simplifies the overall device architecture despite adding haptic functionality.
Solution Approach 2:
The housing is designed to perform multiple functions: providing structural integrity, transmitting audio signals, and enabling localized haptic feedback through integrated EMP actuators. This multi-functionality allows a single component to deliver diverse user feedback mechanisms without proportionally increasing device complexity.
2Ease of operation
If the panel material is thinned or replaced with membrane material at specific locations, then localized haptic response is improved, but the structural integrity of the housing may be compromised
Solution Approach 1:
The housing structure is modified locally at specific regions where EMP actuators will be mounted. Rather than thinning or replacing material throughout the entire housing, only targeted areas are adjusted to have different mechanical properties, allowing localized haptic response while preserving the overall structural integrity of the housing.
3Measurement precision
If force-sensing resistor material is used to sense finger pressure, then user interaction precision is improved, but the device complexity increases
Solution Approach 1:
The force-sensing resistor material is integrated directly into the housing structure at the same locations where EMP actuators are mounted. This combination merges the sensing function with the existing structural and actuation components, allowing pressure detection without adding a separate, complex sensing system.
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
Enables precise and localized haptic feedback, enhancing user interaction by providing tactile and audio confirmation of key presses, while maintaining structural integrity and protecting the device's interior.
Implementation Method 1
The EMP actuators may create both audio and vibro-tactile signals when excited
Implementation Method 2
The EMP actuators may create both audio and vibro-tactile signals when excited. The audio component gives the user an audible confirmation for a key that is pressed
Data Source
AI summary
A housing for an electronic device allows a haptic feedback response that is localized to a specific area on a back panel of the housing of the electronic device. For example, a user holding the mobile electronic device may directly receive haptic feedback in his/her fingers that are supporting the back side of the mobile electronic device. Those specific areas on the back panel may be locations where the panel material is thinned, or locations where the panel material has been removed and replaced by a suitably selected membrane material having favorable mechanical properties. The membrane material may be introduced as an embossment of a membrane layer. In addition, a force-sensing resistor type material may be used as a replacement material, so as to sense the pressure of a user's finger pressing on the embossed structure at the specific locations to which EMP actuators are bonded.