Acoustically Isolated Passive Radiator for Haptic Feedback
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Solution Overview
Problem
Current haptic technologies in electronic devices face challenges in providing effective tactile feedback without compromising audio performance, particularly in mobile devices where space and cost are constraints.
Innovation Solution
Incorporating a passive radiator acoustically coupled between an audio output transducer and a display within a baffle enclosure, isolated from the audio output port, which uses inertia and internal acoustic pressure to generate haptic feedback through the display, often at frequencies below 100 Hz to minimize audio distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a traditional passive radiator is used for haptic feedback, then haptic feedback is provided, but manufacturing cost increases
Solution Approach 1:
The audio output transducer is configured to perform dual functions: audio output through the audio output port and haptic feedback generation through the passive radiator coupled to the display. By making the audio transducer serve multiple purposes, the patent eliminates the need for separate haptic actuator components, thereby reducing manufacturing cost while maintaining haptic feedback performance
Solution Approach 2:
The passive radiator is driven solely by acoustic pressure from the audio output transducer without requiring additional actuators or power sources. The system uses its own audio output mechanism to generate the forces needed for haptic feedback, making the system self-sufficient and reducing component requirements
2Reliability
If audio output transducer operates at low frequencies for haptic feedback, then haptic feedback is effective, but audio distortion increases
Solution Approach 1:
The passive radiator acts as an intermediary between the audio output transducer and the display. It converts acoustic pressure into mechanical force that acts on the display to produce haptic feedback, while the acoustic isolation prevents this low-frequency operation from directly distorting the audio output through the audio port
Solution Approach 2:
The system separates the haptic feedback path from the audio output path using acoustic isolation. The passive radiator creates a distinct mechanical coupling path to the display that is acoustically isolated from the audio output port, allowing independent optimization of haptic and audio performance
3Object-generated harmful factors
If passive radiator is acoustically coupled to audio output port, then audio performance is maintained, but haptic feedback through display is reduced
Solution Approach 1:
The system divides the acoustic coupling into two separate paths: one path from the audio output transducer to the audio output port for audio playback, and another path from the audio output transducer through the passive radiator to the display for haptic feedback. Acoustic isolation prevents interference between these paths, allowing both functions to operate effectively
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
This solution enables efficient haptic feedback provision while maintaining low audio distortion and reducing manufacturing costs, especially suitable for larger displays where traditional passive radiators become costly.
Implementation Method 1
uses inertia and internal acoustic pressure to generate haptic feedback through the display
Implementation Method 2
uses inertia and internal acoustic pressure to generate haptic feedback through the display
Data Source
AI summary
An electronic device may include a housing having an audio output port therein, a display carried by the housing, and a baffle enclosure carried within the housing. The electronic device may also include an audio output transducer carried by the baffle enclosure and acoustically coupled to the audio output port, and a passive radiator carried by the baffle enclosure, acoustically coupled between the audio output transducer and the display, and acoustically isolated from the audio output port.