Sheet Metal Light Blocking Wall for Optical Detection
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Solution Overview
Problem
In biological information detection devices, such as pulsimeters, there is a concern that light from the light emitting portion can incident on the light receiving portion, leading to reduced detection accuracy and reliability of the detected information.
Innovation Solution
An optical detection unit is designed with a light blocking member formed through sheet metal processing, which includes a light blocking wall that prevents light from the light emitting portion from reaching the light receiving portion, reducing the thickness of the metal surface while maintaining strength, and is positioned between the light emitting and receiving portions to improve detection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light blocking member is provided to prevent light from the light emitting portion from reaching the light receiving portion, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The light blocking member is integrated with the board structure, forming a unified component rather than a separate part. This merging approach prevents light leakage while avoiding the complexity of additional independent components, as the light blocking wall is formed as part of the board's structural features
Solution Approach 2:
The light blocking member acts as an intermediary element positioned between the light emitting portion and light receiving portion. It mediates the optical path by selectively blocking direct light while allowing detection of light that has interacted with the measurement target, thereby improving detection accuracy without requiring complete structural redesign
2Strength
If the light blocking wall is formed with sufficient thickness to ensure strength, then structural reliability is improved, but the distance between light emitting and receiving portions increases
Solution Approach 1:
The light blocking member utilizes composite construction combining metal sheets with adhesive layers and board materials. This composite structure achieves sufficient mechanical strength and light blocking performance with reduced thickness compared to solid metal walls, thereby minimizing the distance between optical components while maintaining structural integrity
Solution Approach 2:
The light blocking wall is designed with varying thickness and material properties at different locations. The thickness is optimized locally to provide sufficient strength where needed while minimizing overall thickness in areas where structural support is less critical, thus reducing the distance between light emitting and receiving portions without compromising reliability
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 configuration enhances detection performance by preventing light interference, reducing the distance between the light emitting and receiving portions, and improving sensitivity, while also allowing for a more compact and efficient design of the optical detection unit.
Implementation Method 1
a light blocking member that blocks light from being incident to at least the light receiving portion... the light blocking wall which blocks light from the light emitting portion
Data Source
AI summary
An optical detection unit includes a light emitting portion 150 that emits light toward a target object, a light receiving portion 140 that receives light from the target object, and a light blocking member 70 that blocks light from being incident to at least the light receiving portion 140. The light blocking member 70 includes a light blocking wall 100 that is formed by performing sheet metal processing on a metal, and is provided between the light emitting portion 150 and the light receiving portion 140 so as to block light from the light emitting portion 150 from being incident to the light receiving portion 140. The light blocking wall 100 is formed of a first metal surface 71 of the light blocking member 70.