Photoelectric Module Optics for Superficial Skin Detection
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Solution Overview
Problem
Conventional biomedical detection components face issues with large isolation barriers, uneven encapsulation surfaces, and excessive light energy wastage due to non-directed light emission, which hinder accurate measurement of superficial skin conditions.
Innovation Solution
A biomedical detection photoelectric module with a light-guiding assembly comprising flat optical elements and patterned layers to concentrate light emission and collection, and a manufacturing process using semi-cutting and dispensing to form narrow isolating barriers, reducing module size and enhancing measurement precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If molding or injection molding is used to form the isolation barrier, then the light-emitting region and light-receiving region can be separated, but the isolation barrier width becomes large (>0.5 mm)
Solution Approach 1:
The patent replaces the mechanical molding process with a photoresist-based photolithography process. The isolation barrier is formed by coating a photoresist layer, exposing it through a mask, and developing it to create narrow barriers with precise width control, eliminating the need for mechanical molding and achieving sub-0.5mm isolation barrier widths.
2Ease of manufacture
If dispensing approach is used to form the encapsulation material, then the sensing module can be assembled, but the surface becomes uneven preventing optical coating formation
Solution Approach 1:
The patent replaces the mechanical dispensing process with a spin-coating process. The encapsulation material is applied as a liquid and spun at controlled speeds to form a perfectly flat, uniform surface. This enables subsequent optical coating deposition while maintaining ease of manufacture through automated processing.
3Device complexity
If non-directed light emission is used from the light source, then the light-emitting unit can operate simply, but excessive light energy is wasted
Solution Approach 1:
The patent introduces a light guide as an intermediary component between the light-emitting unit and the skin surface. The light guide receives light from a simple isotropic source and redirects it through total internal reflection to emit light in a controlled direction toward the skin, reducing energy waste while keeping the light-emitting unit structure simple.
4Measurement precision
If the module is designed to measure superficial skin conditions, then the optical path can be shortened, but the isolation barrier must be narrow to prevent interference
Solution Approach 1:
The patent segments the device into distinct functional regions (light-emitting region, light-receiving region, and isolation barrier region) formed in the same planar substrate. This segmentation allows for precise spatial control of each function, enabling narrow isolation barriers that prevent cross-talk while maintaining short optical paths for superficial skin measurement.
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 module effectively measures superficial skin conditions by directing light efficiently and preventing direct interference between light-emitting and photosensitive units, achieving precise detection of tissue fluid states like blood glucose and oxygen levels with reduced energy wastage.
Implementation Method 1
the first patterned layer alters an emitting angle of the first light
Implementation Method 2
the first patterned layer alters an emitting angle of the first light
Implementation Method 3
the second patterned layer alters an incident angle of the second light
Implementation Method 4
the second patterned layer alters an incident angle of the second light
Implementation Method 5
the first light and the second light are blocked by the isolating barriers, preventing the direct incidence of the first light on the photosensitive unit
Data Source
AI summary
The invention provides a biomedical detection photoelectric module, which includes a circuit substrate, a plurality of isolating barriers, a light-emitting unit, a photosensitive unit, and a light-guiding assembly. The light-guiding assembly provides a first optical element and a second optical element, respectively, corresponding to a light-emitting unit and a light-sensing unit. The first optical element has a first pattern layer to alter the emitting angle of the first light generated by the light-emitting unit. The second optical element has a second pattern layer to alter the incident angle of a second optical element entering the light-sensing unit. The first light is guided by the first optical element so that the energy of the first light is concentrated and incident on a predetermined area of a human's skin layer. The second light in the predetermined area is guided by the second optical element to enter the light-sensing unit. The present invention further provides a process method for the biomedical detection photoelectric module.