Toothbrush Sensor Interlock for Eye Safety with Blue Light
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Solution Overview
Problem
Current light-emitting toothbrushes pose a safety risk due to the potential for accidental direct eye exposure to high levels of visible light, which can be harmful, limiting the use of more powerful light sources that could enhance teeth whitening and antimicrobial effects.
Innovation Solution
Incorporating a control mechanism with sensors that deactivate the light source when the toothbrush is outside the mouth and activate it only when in use, using a signal loop through the user's body to ensure safe operation and extend battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a manual on/off switch is used to activate the light-emitting device, then the device can be easily operated, but the user may accidentally expose their eyes to high levels of light that can be harmful to the retina or optic nerve
Solution Approach 1:
The patent introduces an intermediary detection system (optical sensor or conductivity sensor) that acts as a mediator between the manual switch and the light-emitting device. The sensor detects whether the brush head is inside the mouth and automatically controls the light activation, preventing direct manual activation that could cause accidental eye exposure while maintaining ease of use through automatic sensing.
Solution Approach 2:
The patent implements a feedback mechanism where the sensor continuously monitors the position of the brush head (inside or outside the mouth) and provides real-time feedback to the control circuitry. This feedback loop ensures the light-emitting device is activated only when the brush head is properly positioned inside the mouth, preventing harmful eye exposure while maintaining operational simplicity.
2Power
If more powerful light-emitting devices such as high-powered LEDs, laser diodes, or vertical cavity surface emitting lasers are used, then the teeth-whitening and antimicrobial benefits are increased, but the ocular safety risk increases
Solution Approach 1:
The patent uses an intermediary sensor system that detects brush head position and automatically controls the high-powered light-emitting device. This intermediary mechanism ensures that high-power light is emitted only when the brush head is inside the mouth, enabling the use of powerful LEDs, laser diodes, or VCSELs for enhanced teeth-whitening and antimicrobial effects while preventing harmful eye exposure.
Solution Approach 2:
The patent implements a self-service safety mechanism where the sensor and control circuitry automatically monitor and control the light-emitting device operation without requiring user intervention. The system self-regulates to emit high-power light only under safe conditions (brush head inside mouth), enabling use of powerful light sources while inherently preventing ocular exposure risks.
3Ease of operation
If the light source remains activated during handling and storage, then the device is ready for immediate use, but battery life is reduced due to continuous power consumption
Solution Approach 1:
The patent implements a dynamic power management system where the light-emitting device automatically adjusts its operational state based on real-time sensor input. The light is activated only when the sensor detects the brush head is inside the mouth and deactivated when removed, creating a dynamic on-demand operation mode that reduces continuous power consumption while maintaining immediate readiness for use.
Solution Approach 2:
The patent employs periodic sensing and activation cycles where the sensor continuously monitors brush head position and triggers light emission only during actual usage periods. This periodic action pattern replaces continuous operation, significantly reducing battery power consumption while ensuring the light is available immediately when needed during brushing.
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
Prevents eye damage by ensuring the light is only emitted when the toothbrush is in use, allowing for the use of more powerful light sources that enhance whitening and antimicrobial effects while conserving battery life.
Implementation Method 1
An AC or DC signal loop sensor establishes a signal loop through the user's mouth to the user's hand grasping the handle of the toothbrush to verify if the toothbrush head is within the user's mouth
Implementation Method 2
a light source which emits light in the violet and/or blue region of the visible spectrum, between 400nm and 500nm
Implementation Method 3
oxidize and destroy potentially harmful bacteria and/or other contaminants or compounds contained within the mouth
Implementation Method 4
exert a phototoxic effect on pathogenic periodontal and oral bacteria
Implementation Method 5
activate a photo catalyst that may be deposited on the teeth and the gums
Data Source
Figure 1
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AI summary
A short wavelength visible light-emitting toothbrush with an electronic interlock control device preventing operation when the toothbrush is removed from the user's mouth. The electronic interlock control over operation is necessary to prevent accidental eye exposure to the high intensity light source with a wavelength in the range of 400nm to 500nm. The light- emitting toothbrush activates upon entering the user's mouth but deactivates immediately when removed, thus protecting the user's eyes from direct exposure to the high power light source contained in the brush head.