Plenoptic Microlens Array Integration via Solid Spacing Layer
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Solution Overview
Problem
Existing manufacturing techniques for light-field cameras require separate fabrication and assembly of plenoptic and pixel-level microlens arrays, leading to inefficiencies, misalignment, and reduced optical performance due to the introduction of an air gap between components.
Innovation Solution
A photolithographic process is used to integrate a plenoptic microlens array directly with a photosensor array and a solid spacing layer, eliminating the need for an air gap and enabling precise alignment and improved optical performance by positioning the plenoptic MLA face-up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate fabrication and assembly of plenoptic and pixel-level microlens arrays is used, then manufacturing flexibility is improved, but manufacturing precision deteriorates due to misalignment and air gap introduction
Solution Approach 1:
The patent merges the plenoptic microlens array and pixel-level microlens array into a single integrated structure fabricated directly on the photosensor array. This integration eliminates the separate assembly process and the air gap between components, thereby resolving the contradiction by prioritizing manufacturing precision while maintaining ease of manufacture through a unified fabrication process.
2Ease of operation
If air gap is introduced between plenoptic MLA and photosensor array, then ease of assembly is improved, but optical performance deteriorates due to misalignment and reduced reliability
Solution Approach 1:
The patent combines the plenoptic MLA and photosensor array into a single integrated unit, eliminating the air gap that causes misalignment and optical performance degradation. This integration maintains ease of assembly through a unified fabrication process while significantly improving reliability by ensuring precise alignment and stable optical performance.
3Ease of manufacture
If polymer-on-glass approach is used for plenoptic MLA fabrication, then ease of manufacture is improved, but device complexity increases due to multiple separate components
Solution Approach 1:
The patent merges multiple separate components (plenoptic MLA, pixel-level MLA, and photosensor array) into a single integrated device. This integration reduces device complexity by eliminating the need for multiple separate components and their associated assembly processes, while maintaining ease of manufacture through a unified fabrication approach.
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 approach enhances manufacturing efficiency, reduces misalignment and optical performance issues, and allows for precise alignment of the plenoptic MLA with the photosensor array, resulting in improved reliability and cost-effectiveness.
Implementation Method 1
A photolithographic process is used to integrate a plenoptic microlens array directly with a photosensor array
Data Source
AI summary
An optical assembly includes a solid spacing layer between a plenoptic microlens array (MLA) and a pixel-level MLA, avoiding the need for an air gap. Such an assembly, and systems and methods for manufacturing same, can yield improved reliability and efficiency of production, and can avoid many of the problems associated with prior art approaches. In at least one embodiment, the plenoptic MLA, the spacing layer, and the pixel-level MLA are created from optically transmissive polymer(s) deposited on the photosensor array and shaped using photolithographic techniques. Such an approach improves precision in placement and dimensions, and avoids other problems associated with conventional polymer-on-glass architectures. Further variations and techniques are described.