Variable Mounting Sound Wave Touch Pad for Accurate Position Recognition
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Solution Overview
Problem
Conventional sound wave touch pads with surface roughness methods for position recognition have limited recognition effectiveness, leading to system recognition errors and decreased user convenience due to the need for multiple knocking frequencies for commands.
Innovation Solution
A variable mounting sound wave touch pad with deformable mounting members, actuated by electroactive polymers, solenoid plungers, or piezoelectric ceramic elements, which change vibration characteristics and ground levels to enhance sound wave detection and feedback, allowing single-microphone systems to accurately recognize touch positions and inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If surface roughness method is used for position recognition, then the touch pad can detect touch position, but the recognition effectiveness is limited and system recognition errors occur
Solution Approach 1:
The patent applies mechanical vibration by pre-vibrating the touch pad at specific frequencies before touch detection. The touch pad is vibrated at a first frequency for initial position detection and at a second frequency for confirmation, enabling accurate position recognition through vibration-based sound wave analysis rather than relying on surface roughness alone.
Solution Approach 2:
The patent implements periodic action by using multiple sequential vibration frequencies. The system first vibrates the touch pad at a first frequency to detect initial touch position, then vibrates at a second frequency to confirm the position, creating a periodic detection process that improves recognition reliability and eliminates errors.
2Adaptability or versatility
If multiple knocking frequencies are used for commands, then more commands can be recognized, but system recognition errors increase and user convenience decreases
Solution Approach 1:
The patent applies feedback by providing audible sound wave feedback when a user touches the touch pad. The microphone detects the sound wave generated by the touch, and the system provides feedback indicating the detected position and recognized command, allowing users to confirm whether their input was correctly interpreted without needing to learn multiple knocking frequencies.
Solution Approach 2:
The touch pad performs self-service by automatically detecting touch position through sound wave analysis and providing feedback without requiring the user to learn specific knocking patterns. The system autonomously identifies touch位置 and commands based on the sound wave characteristics, eliminating the need for users to memorize multiple knocking frequencies.
3Measurement precision
If multiple microphones are used for position recognition, then position accuracy improves, but device complexity and cost increase
Solution Approach 1:
The patent uses mechanical vibration of the entire touch pad surface to generate detectable sound waves at the touch location. A single microphone can detect these vibration-induced sound waves and determine the touch position by analyzing the sound wave characteristics, achieving position detection accuracy without requiring multiple microphones.
Solution Approach 2:
The touch pad itself acts as an intermediary between the user's touch and the microphone detection. The touch pad vibrates in response to user input and transmits these vibrations as sound waves to the single microphone, enabling the microphone to indirectly detect touch position through the mediating vibration transmission rather than requiring direct acoustic field mapping with multiple microphones.
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 improves user convenience and recognition accuracy by generating distinct sound waves for different touch positions and inputs, reducing the complexity of commands and enhancing user experience and safety, while maintaining cost-effectiveness with a simple microphone structure.
Implementation Method 1
The mounting members may be provided with an electroactive polymer, and the shape of the electroactive polymer deforms when an electrical signal is applied.
Implementation Method 2
The mounting member may be provided with a piezoelectric ceramic element, the shape of the piezoelectric ceramic element deforms due to a pressure generated when an electrical signal is applied.
Implementation Method 3
The mounting member may be provided with a solenoid plunger which moves when being applied with an electrical signal.
Implementation Method 4
an upper touch pad connected to a microphone to recognize a sound wave
Data Source
AI summary
A variable mounting sound wave touch pad includes an upper touch pad connected to a microphone to recognize a sound wave. A lower touch pad is spaced apart from the upper touch pad. A plurality of mounting members have one end attached to the lower touch pad and the other end protruding toward the upper touch pad and vary by an actuator which interlocks with the lower touch pad.