Imaging Apparatus Light Shielding Layer Crosstalk Prevention
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Solution Overview
Problem
The existing imaging apparatuses face complications due to a complex light shielding layer structure, leading to beam crosstalk issues when using a thin film substrate with opening sections for light sensing elements, which complicates configuration and affects accuracy.
Innovation Solution
An imaging apparatus with a light-transmitting substrate featuring a light shielding layer on its surface, where the opening sections for lenses are designed with specific dimensions and angles to prevent beam crosstalk, ensuring that only intended light reaches the light sensing elements, and using substrates with matching thermal expansion coefficients to maintain structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a light shielding layer of thin film type with opening sections is used, then the configuration is simplified, but beam crosstalk occurs where light from outside the lens reaches the light sensing elements
Solution Approach 1:
The light shielding layer is designed with locally differentiated properties: opening sections with specific diameters smaller than reference regions for each lens, and angled side surfaces. This local variation in geometry prevents beam crosstalk while maintaining overall configuration simplicity. Each opening section's diameter is specifically controlled to be smaller than its corresponding reference region, creating local optical isolation.
Solution Approach 2:
The invention introduces angular dimension control by forming side surfaces of opening sections at specific angles relative to the substrate. This angular parameter (α) is controlled to be greater than the maximum refraction angle of the lens, adding a dimensional constraint that prevents oblique light from reaching adjacent sensing elements while maintaining the thin film structure.
2Measurement precision
If opening sections are made smaller to prevent beam crosstalk, then measurement precision is improved, but the amount of light reaching sensing elements decreases
Solution Approach 1:
The invention optimizes multiple parameters simultaneously: opening section diameter (controlled to be smaller than reference region), side surface angle (α > maximum refraction angle), and opening section area ratio (5-50% of lens area). These parameter changes collectively achieve beam crosstalk prevention while maintaining sufficient light transmission by balancing the size constraints with optical geometry.
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 simplifies the apparatus, prevents beam crosstalk, and maintains high accuracy by ensuring that external light does not reach the light sensing elements, while also minimizing thermal stress and position deviations.
Implementation Method 1
a plurality of lenses which is placed in a planar shape along the first surface and concentrates incident light
Implementation Method 2
lenses (micro lenses) 941 corresponding to the respective light sensing elements 921
Implementation Method 3
a light shielding layer which is formed on the second surface and has an opening section
Implementation Method 4
light shielding plate-like member
Data Source
AI summary
An imaging apparatus includes light-transmitting substrate; a plurality of lenses which faces a first surface of the substrate; a light shielding layer which is formed on the second surface of the substrate and has an opening section through which optical axes of each lens pass; and a plurality of light sensing elements which is placed so that the optical axes of the lenses pass through a light sensing surface facing the second surface at an interval. An efficient diameter of the lens, a diameter of the opening section, a distance between the light sensing surfaces and the light shielding layer, a diameter of the light sensing surface, and a distance between the light sensing surface and center of the lens satisfy a<(h·D+h·d−s·d)/s and tan−1{(p−a/2−d/2)/h}>sin−1(1/n).