Smoke Alarm Light Shielding Unit Flat Surface Design
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Solution Overview
Problem
Conventional smoke alarms face issues with detection accuracy due to excessive light reflection from labyrinth walls, which can lead to false triggers and reduced effectiveness in smoke detection.
Innovation Solution
The introduction of a light shielding unit with a flat side surface design that inhibits ambient light and reflected detection light from entering the light receiving unit's field of view, ensuring accurate smoke detection by preventing excessive light reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If labyrinth walls are provided with gaps and non-flat shapes to detect smoke, then smoke detection capability is improved, but light reflected by labyrinth walls enters the light receiving unit's field of view causing excessive light reception
Solution Approach 1:
The light shielding unit is divided into multiple labyrinth walls that are arranged to form a segmented structure. Each labyrinth wall has gaps between adjacent walls, allowing smoke to pass through while the segmented configuration blocks reflected light from reaching the light receiving unit. This segmentation enables simultaneous smoke detection and light reflection prevention.
Solution Approach 2:
The light shielding unit acts as an intermediary element positioned between the light emitting unit and the light receiving unit. It mediates the optical path by allowing detection light to reach smoke particles while blocking reflected light from entering the light receiving unit's field of view, thus preventing false detection signals.
2Measurement precision
If the detection space is opened to allow smoke flow, then smoke detection sensitivity is improved, but ambient light enters the detection space causing false alarms
Solution Approach 1:
The light shielding unit is strategically positioned at specific locations around the detection space, particularly at the periphery and near the light receiving unit. This localized shielding approach allows smoke to freely enter and circulate in the detection space while blocking ambient light from entering critical areas, thus maintaining detection sensitivity without false alarms.
Solution Approach 2:
The light shielding unit extends in multiple spatial dimensions, forming a three-dimensional barrier around the detection space. By adding this spatial dimension of protection, the system allows smoke to access the detection volume from all directions while blocking ambient light from entering the detection space, thus maintaining sensitivity without interference.
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 enhances the detection accuracy of smoke alarms by preventing excessive light from entering the light receiving unit, thereby improving the reliability of smoke detection and reducing false alarms.
Implementation Method 1
when light radiated from the light emitting unit is scattered by particles of smoke flowing into the detection space, the light receiving unit receives the scattered light
Implementation Method 2
at least a part of a side surface of the light shielding unit on a side of the detection space is formed in a flat shape capable of inhibiting the detection light reflected by the light shielding unit from entering a field of view of the light receiving unit
Data Source
AI summary
A detection unit that detects smoke contained in a gas by radiating detection light toward a detection space for detecting smoke, and an inner labyrinth for inhibiting ambient light from entering the detection space, the inner labyrinth being provided to cover an outer edge of the detection space are included, the detection unit includes a light emitting unit that radiates the detection light and a light receiving unit that receives the detection light radiated by the light emitting unit, and at least a part of a side surface of the inner labyrinth on a side of the detection space is formed in a flat shape capable of inhibiting the detection light reflected by the inner labyrinth from entering a field of view RV of the light receiving unit in the detection space.