Haptic Actuator Housing Venting for Higher Vibration Amplitude
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Solution Overview
Problem
Haptic actuators in electronic devices face challenges in generating effective vibrations due to air pressure resistance within the device housing, which limits the amplitude of haptic feedback.
Innovation Solution
Incorporating a piezoelectric actuator within a housing with dissipation openings that increase air flow, reducing pressure and enhancing the amplitude of haptic vibrations by allowing air displaced by the actuator to escape, thus minimizing resistance and increasing the vibration amplitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing is sealed to protect internal components, then reliability is improved, but air pressure resistance increases and haptic vibration amplitude decreases
Solution Approach 1:
The housing is segmented into multiple regions: a sealed first cavity containing the haptic actuator and a second cavity connected via dissipation openings. This segmentation allows the first cavity to maintain protection while the second cavity manages air pressure through controlled openings, resolving the contradiction between sealed protection and vibration amplitude.
Solution Approach 2:
The dissipation openings act as an intermediary element between the sealed first cavity and the external environment. They allow air pressure equalization to improve haptic vibration amplitude while maintaining the sealed structure's protective function, thus resolving the contradiction between reliability and vibration strength.
2Strength
If dissipation openings are added to reduce air pressure resistance, then haptic vibration amplitude is improved, but device complexity increases
Solution Approach 1:
The housing structure is designed to serve multiple functions: it provides mechanical protection, defines cavities for component mounting, and incorporates dissipation openings for air pressure management. By integrating these functions into a single housing design, the patent avoids additional complex components while improving haptic vibration amplitude.
Solution Approach 2:
The dissipation openings are integrated directly into the housing structure rather than being separate components. This merging of air pressure management functionality into the existing housing reduces overall device complexity while achieving the goal of improved haptic vibration amplitude through reduced air pressure resistance.
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 increases the amplitude of haptic vibrations, providing stronger and more perceptible feedback to users while maintaining the same energy input, by reducing air pressure within the housing through dissipation openings.
Implementation Method 1
a piezoelectric actuator mounted within the first cavity
Implementation Method 2
a dissipation opening defined in the material of the housing that increases air flow from the cavity... The air flowing through the dissipation opening may have the effect of reducing pressure in the housing
Data Source
AI summary
An apparatus may include a substrate in a capacitance module, a first cavity in the substrate, a first housing in the cavity, a piezoelectric haptic actuator in the housing, and a dissipation opening defined in the housing that increases air flow from the first cavity to the outside of the apparatus.