Image Acquisition Device with Refractive-Index-Matched Bonding
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Solution Overview
Problem
Existing image acquisition devices suffer from reduced detection accuracy due to interference fringes and distortion of the view angle control film and optical sensor under high temperature conditions, particularly when imaging microorganisms in culture media.
Innovation Solution
The device incorporates a light-transmitting adhesive layer between the view angle control film and the optical sensor, bonded to both, with elastic members pushing the container against the film to minimize gaps and distortions, and uses a refractive index-matched adhesive to reduce Fresnel reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the view angle control film and optical sensor are directly bonded without adhesive, then device complexity is reduced, but manufacturing precision and detection accuracy deteriorate due to gaps and misalignment
Solution Approach 1:
A light-transmitting adhesive layer is introduced as an intermediary between the view angle control film and the optical sensor. This adhesive layer serves multiple functions: it fills gaps between components, ensures precise alignment, and maintains optical transparency. The adhesive layer with refractive index 1.48-1.65 is specifically designed to match the optical properties of adjacent components, eliminating refractive index mismatches while providing mechanical bonding.
2Measurement precision
If elastic members are added to press the container against the view angle control film, then detection accuracy is improved by minimizing gaps, but device complexity increases
Solution Approach 1:
Elastic members are positioned to automatically adjust and maintain optimal pressure between the container and the view angle control film. The elastic members self-regulate the contact force based on thermal expansion and mechanical deformation, ensuring continuous gap-free contact without requiring external adjustment mechanisms. This self-adjusting mechanism compensates for thermal effects and manufacturing tolerances.
3Ease of manufacture
If conventional adhesive is used between view angle control film and optical sensor, then ease of manufacture is improved, but detection accuracy deteriorates due to Fresnel reflections
Solution Approach 1:
The refractive index of the adhesive layer is specifically controlled to fall within the range of 1.48-1.65, matching the refractive indices of the view angle control film and optical sensor. This parameter optimization minimizes Fresnel reflections at the interfaces. The adhesive layer thickness is controlled at 10-100 μm to balance optical performance with mechanical bonding requirements.
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 accuracy by minimizing interference fringes and maintaining sensor alignment, even under high temperature conditions, resulting in clearer images of microorganisms.
Implementation Method 1
a light-transmitting adhesive layer between the view angle control film and the optical sensor and configured to bond the view angle control film to the optical sensor
Implementation Method 2
uses a refractive index-matched adhesive to reduce Fresnel reflections
Implementation Method 3
an elastic member configured to push up and urge the holding member upward to press the container against the view angle control film
Implementation Method 4
Light emitted from the light source passes through the objects to be detected and the culture medium in the container, and reaches the optical sensor. The optical sensor can image the objects to be detected because the quantity of light emitted to photodiodes of the optical sensor differs
Data Source
AI summary
According to an aspect, an image acquisition device includes, in sequence: a light source; a holding member configured to hold a container accommodating an object to be detected; a view angle control film; and a planar optical sensor. The image acquisition device further includes: a light-transmitting adhesive layer between the view angle control film and the optical sensor and configured to bond the view angle control film to the optical sensor; and an elastic member configured to push up and urge the holding member upward to press the container against the view angle control film.