Motor-Microphone Damping Layout for Cleaner Stabilizer Audio
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Solution Overview
Problem
Stabilization mechanisms for image capture devices face limitations due to structural vibration conduction noise and acoustic noise, resulting in poor audio quality, primarily caused by the natural resonance of solid shafts in motor-driven systems.
Innovation Solution
The implementation of an improved motor design and microphone configuration that includes a dampener, such as a silicon rubber component, coupled between the housing and the printed circuit board, to reduce vibration and acoustic noise by adjusting the natural resonance of the motor shaft to non-overlapping frequencies, and utilizing a microphone to detect and mitigate these noises.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If solid shafts are used in motor-driven stabilization mechanisms, then the motor can operate at required frequencies, but natural resonance causes structural vibration conduction noise and acoustic noise
Solution Approach 1:
A dampener is introduced as an intermediary component between the motor shaft and the housing/PCB. This dampener absorbs and dissipates vibrational energy, preventing the transmission of structural noise while allowing the motor to operate at its required frequencies without modification.
Solution Approach 2:
The natural resonance frequency of the motor shaft system is modified by changing physical parameters such as shaft stiffness, mass distribution, or damping characteristics. This shifts the resonance frequency away from the motor's operating frequency, eliminating the harmful resonance effect while maintaining operational performance.
2Object-generated harmful factors
If dampeners are added to reduce vibration noise, then audio quality improves, but device complexity increases
Solution Approach 1:
The dampener is designed to perform multiple functions simultaneously: it reduces structural vibration transmission, absorbs acoustic noise, and potentially serves as a mounting structure or structural support element. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
3Measurement precision
If microphones are positioned to detect noise via ports, then audio capture improves, but susceptibility to external interference increases
Solution Approach 1:
Different ports are designed with different acoustic characteristics tailored to their specific detection needs. For example, certain ports may have specific geometries, filtering structures, or damping materials that optimize them for detecting low-frequency motor noise while being less susceptible to high-frequency external interference, allowing the microphone to capture relevant audio signals with improved precision.
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 effectively reduces structural vibration conduction noise and acoustic noise, enhancing the audio quality during image capture by decoupling the motor's natural resonance from its operating frequency, thereby improving the overall performance of image stabilization devices.
Implementation Method 1
The dampener may comprise a silicon rubber component that is configured to reduce the vibration noise from the motor
Implementation Method 2
The dampener may be configured to reduce the acoustic noise from the motor
Implementation Method 3
The microphone may be configured to detect audio waves via the first port and the second port. The audio waves may include acoustic noise from the motor
Data Source
AI summary
A handheld image stabilization device or an image capture device includes a housing, a motor, a microphone, and a dampener. The housing includes a first port. The motor is attached to the housing. The microphone detects audio waves via the first port and vibration noise of the motor via the housing. The audio waves may include acoustic noise from the motor. The dampener is coupled to the housing. The dampener reduces the acoustic noise from the motor and the vibration noise from the motor.