Thin Lens Scatterers Correct Coma Aberration
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Solution Overview
Problem
Existing focusing devices for optical sensors in mobile and IoT devices face challenges in reducing thickness due to limited field of view caused by coma aberration, which is difficult to address with conventional multiple lens combinations that require substantial space.
Innovation Solution
A focusing device with a substrate featuring a first thin lens and a second thin lens, each comprising scatterers that correct geometric aberrations, allowing light to focus on a focal plane regardless of incident angle, and an optical filter to block unwanted wavelengths, enabling size reduction while maintaining effective focusing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional multiple optical lenses are combined to remove coma aberration, then geometric aberration correction is improved, but device size increases due to substantial space requirements
Solution Approach 1:
The patent merges multiple lens functions into a single substrate by forming first and second thin lenses on opposite surfaces of the same substrate. This integration allows coma aberration correction without requiring separate lens components, thereby reducing device size while maintaining aberration correction capability.
Solution Approach 2:
The patent utilizes the third dimension (substrate thickness) to accommodate multiple lens functions. By forming lenses on both surfaces of a substrate with controlled thickness (10-50 μm), the design exploits dimensional space to integrate multiple optical functions without increasing lateral device footprint.
2Length of moving object
If focusing device thickness is reduced for size reduction, then device compactness is improved, but field of view is limited by coma aberration
Solution Approach 1:
The patent combines coma aberration correction functionality into the thin substrate structure itself through the first and second thin lenses. This integration allows the device to maintain a reduced thickness of 10-50 μm while still correcting coma aberration to achieve a wide field of view of 60 degrees or more.
Solution Approach 2:
The patent optimizes specific parameters including substrate thickness (10-50 μm), scatterer dimensions (height 1-5 μm, diameter 0.5-2 μm), and scatterer spacing (0.5-2 μm) to simultaneously achieve thin profile, wide field of view, and effective aberration correction. These parameter adjustments enable the device to overcome the traditional trade-off between thickness and field of view.
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 solution allows for a compact focusing device with a wide field of view, effectively correcting coma aberration and maintaining focusing accuracy across various incident angles and wavelengths, thus enhancing the performance and miniaturization of optical sensors.
Implementation Method 1
a first thin lens provided at a first surface of the substrate and comprising a plurality of first scatterers; and a second thin lens provided at a second surface of the substrate and comprising a plurality of second scatterers
Implementation Method 2
A phase shift of light that passes through the second scatterers may decrease from a central area of the second thin lens to a peripheral area of the second thin lens
Data Source
AI summary
A focusing device includes a substrate and a plurality of scatterers provided at both sides of the substrate. The scatterers on the both sides of the focusing device may correct geometric aberration, and thus, a field of view (FOV) of the focusing device may be widened.