Stacked Photosensor Array for Multi-Focal Imaging
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Solution Overview
Problem
Conventional camera systems face challenges in capturing high-quality images across a wide range of focal lengths due to limitations in depth of field and image sharpness, particularly in multi-focal length imaging applications.
Innovation Solution
The implementation of a stacked photosensor array structure with multiple layers of photodetectors, where each layer is positioned to capture images from specific object distances, allowing for multi-focal length imaging by passing light through transparent materials and using optically transmissive mediums to achieve high resolution and contrast across varying focal lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single image sensor is used, then the device complexity is low, but the image sharpness and depth of field are limited
Solution Approach 1:
The image sensor is segmented into multiple stacked layers, each containing photodetectors positioned at different depths. This segmentation allows each layer to capture light from specific depth ranges, thereby improving image sharpness for objects at different distances while maintaining a manageable structural complexity through systematic layering.
Solution Approach 2:
The patent transitions from a conventional 2D sensor plane to a 3D stacked architecture, adding the depth dimension to photodetector positioning. This dimensional change enables multi-focal length imaging by capturing light at multiple depth planes simultaneously, resolving the contradiction between image sharpness and device complexity.
2Adaptability or versatility
If multiple stacked photodetector layers are used, then multi-focal length imaging is achieved, but the device complexity increases
Solution Approach 1:
The stacked photodetector array is designed to perform multiple functions: capturing images at different focal lengths, determining depth information, and providing multi-focal length imaging capability. This multi-functionality reduces the need for additional separate components, thereby managing device complexity while achieving versatile imaging capabilities.
Solution Approach 2:
Multiple photodetector layers are nested vertically within a compact stacked structure, with each layer containing photodetectors at specific depths. This nesting approach enables multi-focal length imaging by positioning photodetectors at different distances from the lens, achieving adaptability while containing device complexity through space-efficient vertical integration.
3Adaptability or versatility
If photodetectors are positioned at different depths, then depth of field is extended, but the manufacturing precision requirements increase
Solution Approach 1:
Each photodetector layer is designed with local quality optimization, where photodetectors within the same layer are positioned at the same depth to capture light from specific depth ranges. This local uniformity simplifies manufacturing precision requirements compared to requiring each individual photodetector to be precisely positioned, while still achieving extended depth of field through the collective arrangement of multiple layers.
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 solution enables camera sensors to provide high-resolution, sharp images from objects at distances ranging from six inches to infinity, overcoming traditional depth of field limitations and achieving improved image quality by combining signals from multiple sensors.
Implementation Method 1
Each layer comprises one or more photodetectors... The stack positions different of the photodetectors at different distances from the lens, so that they provide dominant responses to light captured from objects at different distances from the lens
Implementation Method 2
passing light through transparent materials and using optically transmissive mediums
Data Source
AI summary
The advent of electronic-based imaging generally followed the four generalized ‘eras’ identified in FIG. 16 The trend is clearly toward higher and higher levels of integration for the act of “taking pictures.” FIG. 17 is a humble graphic attempt to summarize certain aspect of the present technology, and how a synthesis of these additional technical capabilities can represent a next era quite nicely. To the extent a great deal of past photography and filming has involved the mastery of technical limitations and turning limitations into art, a new challenge should develop where everyone has their own pocket Hasselblad/Steadicam, and exploration of new subject matter becomes the game.