External Optical Sensor for Toothbrush Navigation
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Solution Overview
Problem
Current toothbrush navigation systems are cumbersome and expensive due to the need for complex electronics and energy storage, and they often fail to provide accurate and comprehensive feedback on brushing technique and pressure, leading to inadequate oral hygiene.
Innovation Solution
A toothbrush navigation system that uses a separate optical sensor device to detect the spatial position and pressure of a toothbrush with a piezochromic pressure indicator, eliminating the need for internal sensors and electronics in the toothbrush, allowing for a more ergonomic and cost-effective design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electronic components and energy storage devices are integrated into the toothbrush to provide brush pressure indication and navigation, then brushing feedback accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the electronic components and energy storage device from the toothbrush by using an external optical sensor device (smartphone) to detect brush position and pressure. The toothbrush itself remains simple and manual, while the measurement and feedback functions are performed externally through the optical sensor system that captures images and processes position data without requiring embedded electronics in the brush.
Solution Approach 2:
The patent introduces an intermediary optical sensor device (smartphone or separate sensor system) that acts as a mediator between the toothbrush and the feedback system. This external device captures optical data about brush position and pressure, processes the information, and provides navigation instructions, eliminating the need for complex internal electronics in the toothbrush while maintaining accurate feedback.
2Measurement precision
If electronic components and energy storage devices are integrated into the toothbrush to provide brush pressure indication and navigation, then brushing feedback accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts the expensive electronic components and energy storage devices from the toothbrush design. By using an external optical sensor system (smartphone), the system eliminates the need for costly internal electronics, batteries, and complex manufacturing processes in the toothbrush itself, while still providing accurate brush pressure indication and navigation feedback.
Solution Approach 2:
The patent employs a simple, inexpensive optical sensor device (smartphone camera) that can be reused across multiple brushing sessions without requiring expensive integrated components. The system leverages existing cheap optical sensing technology rather than developing costly specialized sensors for the toothbrush, significantly reducing manufacturing costs.
3Device complexity
If an optical sensor device is used externally to detect toothbrush position, then device complexity is reduced, but measurement precision of brush position may be insufficient
Solution Approach 1:
The patent implements a feedback mechanism where the optical sensor device continuously captures images of the toothbrush during use, processes the position data in real-time, and provides navigation instructions based on the detected brush position. This closed-loop feedback system compensates for any limitations in external sensing by actively guiding the user through the brushing process, maintaining high measurement precision despite the simplified toothbrush design.
Solution Approach 2:
The patent uses optical imaging to create a visual copy or representation of the toothbrush position and orientation. By capturing images of the brush against the teeth and processing these visual copies, the system can accurately determine brush position without requiring complex mechanical sensors, achieving high measurement precision through optical copying rather than direct mechanical sensing.
4Ease of operation
If a piezochromic pressure indicator is used to show brush pressure, then ease of operation is improved, but device complexity increases due to additional optical components
Solution Approach 1:
The patent incorporates a piezochromic pressure indicator that changes color in response to brush pressure. This color-change mechanism provides intuitive, immediate feedback to the user about their brushing pressure without requiring complex electronic displays or additional optical sensing components. The pressure indicator is integrated directly into the toothbrush structure, allowing users to easily assess their technique through visual color changes rather than requiring sophisticated electronic interfaces.
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 provides accurate and comprehensive feedback on brushing technique and pressure, improving oral hygiene by enabling users to maintain proper brushing habits without the bulk and expense of electronic components in the toothbrush.
Implementation Method 1
The optical sensor device is configured to use the brush pressure display of the pressure indicator as an optical marker when detecting the spatial position of the toothbrush
Implementation Method 2
an optical sensor device separate from the toothbrush for detecting the spatial position of the toothbrush
Data Source
Figure 1~2
Figure 3~6
AI summary
The invention relates to a toothbrush navigation system (1) comprising a toothbrush (2), an optical sensor device (14) separate from the toothbrush (2) for detecting the spatial position of the toothbrush (2), and a playback device (15) separate from the toothbrush (2) and connected to the optical sensor device (14) for communicating with it, in order to reproduce instructions and/or status information for toothbrushing based on the spatial position of the toothbrush (2) detected by the optical sensor device (14) in a recognizable manner for a user of the toothbrush (2). According to the invention, the toothbrush (2) has at least one passive pressure indicator (8) for optically displaying the brush pressure, and the optical sensor device (14) is configured to use the brush pressure reading of the pressure indicator (8) as an optical marker when detecting the spatial position of the toothbrush (2).