Acoustic Electret Transducer for 3D Motion Direction Sensing
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Solution Overview
Problem
Conventional distance measuring equipment cannot precisely and in real time detect the direction and velocity of a moving object in 3D space, limiting their application in detecting moving objects effectively.
Innovation Solution
An electronic device with an acoustic transducer comprising a conductive substrate, an electret diaphragm, spacers, a first electrode, and two second electrodes, which defines an acoustic projecting portion and two acoustic receiving portions to transmit and receive acoustic signals, allowing for the detection of moving direction and velocity by varying the electrical field between the second electrodes and the conductive substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional distance measuring equipment transmits acoustic signals along a single direction, then the device structure is simple, but it cannot precisely detect direction and velocity of moving objects in 3D space
Solution Approach 1:
The acoustic transducer is divided into multiple acoustic receiving portions (first, second, third receiving portions) that receive acoustic signals from different directions. Each receiving portion is equipped with electrodes that detect electrical field variations independently, enabling precise determination of both direction and velocity of moving objects through comparative analysis of signals from multiple segments.
Solution Approach 2:
The invention transitions from single-direction acoustic signal detection to three-dimensional space detection by arranging multiple acoustic receiving portions in different spatial orientations. The electret diaphragm with multiple receiving portions detects acoustic signals along different axes, and by analyzing the phase and amplitude differences across these dimensions, the system precisely determines both direction and velocity of moving objects in 3D space.
2Adaptability or versatility
If touch screen detects contact on surface, then the detection is simple, but it cannot detect moving object in 3D space
Solution Approach 1:
The electret diaphragm serves multiple functions: it acts as both a traditional acoustic sensor for contact detection on the screen surface and as a three-dimensional motion detector for moving objects in space. By integrating multiple acoustic receiving portions with electrode arrays, the same component can detect both touch contact and spatial motion, eliminating the need for separate detection systems.
Solution Approach 2:
The invention merges the traditional touch detection function with the new 3D motion detection function into a single integrated acoustic transducer system. The electret diaphragm combines multiple receiving portions and electrode structures that simultaneously perform both touch sensing and spatial trajectory tracking, reducing overall system complexity while enhancing versatility.
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 real-time detection of moving objects' direction and velocity, enhancing the capability of electronic devices like mobile phones to interact with objects in their environment beyond basic touch screen functionality.
Implementation Method 1
The first electrode M1 is disposed on the acoustic projecting portion P and coupled with the conductive substrate 10 for generating an acoustic signal
Implementation Method 2
the acoustic receiving portions receive the acoustic signal and vibrate to vary an electrical field between the second electrodes M2 and the conductive substrate 10
Implementation Method 3
vibrate to vary an electrical field between the second electrodes M2 and the conductive substrate 10
Data Source
AI summary
An electronic device is provided, including a conductive substrate, an electret diaphragm, a plurality of spacers, a first electrode, and two second electrodes. The conductive substrate has a plurality of openings. The spacers are disposed between the conductive substrate and the electret diaphragm to define an acoustic projecting portion and two acoustic receiving portions on the electret diaphragm. The first electrode is disposed on the acoustic projecting portion and coupled with the conductive substrate for generating an acoustic signal. The second electrodes are disposed on the acoustic receiving portions and coupled with the conductive substrate, wherein the acoustic receiving portions receive the acoustic signal and vibrate to vary an electrical field between the second electrodes and the conductive substrate.