Speaker Driver Optical Displacement Sensing Without Moving-Part Load
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Solution Overview
Problem
Current displacement measurement methods for drivers in speakers are cumbersome, space-consuming, and impact driver performance by requiring additional components on the moving parts.
Innovation Solution
A method and speaker design incorporating an optical sensor placed in a stationary position with line-of-sight to the moving part, allowing for non-intrusive displacement measurement without additional components on the moving part, using optical sensors to receive and process light reflections or transmissions for displacement calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional displacement measurement methods are used, then displacement measurement is achieved, but the measurement is cumbersome and consumes a lot of space
Solution Approach 1:
The patent replaces traditional mechanical displacement measurement systems with an optical measurement system. An optical sensor captures images of the moving part (such as the voice coil or diaphragm) at different positions, and a processing device calculates displacement based on image analysis. This substitution eliminates the need for complex mechanical measurement components, reducing device complexity while maintaining measurement precision.
2Measurement precision
If traditional displacement measurement methods are used, then displacement measurement is achieved, but additional components are placed on the moving part impacting driver performance
Solution Approach 1:
The patent extracts the measurement function from the moving part itself and places it in the stationary structure. Instead of adding sensors to the moving part (voice coil or diaphragm), the optical sensor is mounted on the housing or frame, and it observes the moving part from a stationary position. This extraction eliminates the impact of additional components on the moving part, preserving driver performance and reliability while still achieving accurate displacement measurement.
3Measurement precision
If traditional displacement measurement methods are used, then displacement measurement is achieved, but a lot of space is consumed limiting driver design and integration
Solution Approach 1:
The patent transitions from a one-dimensional mechanical measurement approach to a two-dimensional optical measurement approach. By capturing images in two dimensions and analyzing pixel positions, the system achieves accurate displacement measurement without requiring additional physical space in the traditional measurement direction. This dimensional change allows the measurement system to be integrated into the existing driver structure with minimal space consumption.
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 non-intrusive displacement measurement, allowing for more accurate driver performance monitoring and enabling features like bass boost without distortion, while not affecting the driver's performance or requiring additional space.
Implementation Method 1
receiving, by the optical sensor, light reflected by or transmitting through the moving part
Data Source
AI summary
A method for displacement measurement in a driver and a speaker are disclosed. The method comprises, choosing a stationary position for fixing an optical sensor inside or outside the driver, placing the optical sensor by using the stationary position, wherein the optical sensor is in line-of-sight to a moving part of the driver and faces the moving part; receiving, by the optical sensor, light reflected by or transmitting through the moving part, and processing, by a processing device, signals for the received light from the optical sensor to calculate displacement of the moving part.