Light Detection Unit With Composite Light Blocking Member
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Solution Overview
Problem
In biological information detection apparatuses, the reliability and accuracy of detection signals can be compromised due to direct light from the light emitter entering the light receiver, affecting detection performance.
Innovation Solution
A light detection unit is designed with a light blocking member that includes a first surface made of a metal material between the light emitter and receiver, and second and third surfaces made of a different material, such as plastic, to prevent direct light from entering the receiver, thereby improving detection performance and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light blocking member is introduced to prevent direct light from entering the light receiver, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The light blocking member is integrated with the light receiver housing, merging the light blocking function into the existing structural component. This approach prevents direct light from entering the light receiver while avoiding the need for separate, independent light blocking components, thus improving detection accuracy without proportionally increasing device complexity.
2Reliability
If a metal material is used for the first surface of the light blocking member, then light blocking performance is improved, but manufacturing cost increases
Solution Approach 1:
Different materials are used for different surfaces of the light blocking member: the first surface (requiring high light blocking performance) is made of metal, while the second and third surfaces (requiring structural support and cost-effectiveness) are made of plastic. This localized material selection optimizes both light blocking performance and manufacturing cost.
Solution Approach 2:
The light blocking member is constructed as a composite structure combining metal and plastic materials. The metal first surface provides superior light blocking performance, while the plastic second and third surfaces provide structural integrity and reduce overall manufacturing cost, creating an optimized composite solution.
3Measurement precision
If the distance between light emitter and light receiver is shortened, then detection sensitivity is improved, but the risk of direct light entering the receiver increases
Solution Approach 1:
The light blocking member acts as an intermediary element positioned between the light emitter and light receiver. It allows the distance between emitter and receiver to be shortened for improved detection sensitivity while simultaneously blocking direct light paths that would cause interference, thus resolving the contradiction between proximity and 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
The configuration effectively blocks direct light from the light emitter, enhancing the sensitivity and accuracy of detection signals while allowing for a more compact and cost-effective design of the light detection unit.
Implementation Method 1
a light blocking member that performs light blocking at least on or above the light receiver... prevents direct light from the light emitter from entering the light receiver
Data Source
AI summary
A light detection unit includes a light emitter that emits light toward an object of interest, a light receiver that receives light from the object of interest, and a light blocking member that performs light blocking at least above the light receiver. The light blocking member includes a first surface that is provided between the light emitter and the light receiver and prevents direct light from the light emitter from entering the light receiver and a second surface and a third surface that are provided along a direction that intersects the first surface and prevent light from entering the light receiver. Further, the first surface is made of a first material, and the second surface and the third surface are made of a second material different from the first material.