Ultrathin Camera Microlens Array Multi-Distance Imaging
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Solution Overview
Problem
Conventional cameras face limitations in simultaneously performing long-distance and short-distance imaging due to focal length constraints, leading to image distortion and reduced resolution, and global shutter image sensors are costly and prone to noise.
Innovation Solution
An ultrathin camera device utilizing a microlens array with a very short focal length, combined with a rolling shutter-type image sensor and processor, enables simultaneous imaging of objects at multiple distances, generating high frame rate images, microscopic, 3D depth, and high dynamic range images by reconstructing array images based on viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional lens with long focal length is used, then long-distance imaging is achieved, but short-distance imaging becomes out of focus
Solution Approach 1:
The patent divides the imaging system into multiple microlenses with different focal lengths, where each microlens is responsible for a specific distance range (short-distance, medium-distance, long-distance imaging). This segmentation allows the system to maintain focus accuracy across varying distances by selecting the appropriate microlens for each imaging task.
Solution Approach 2:
The patent creates a multi-functional imaging system where a single camera module can perform multiple imaging functions (short-distance, medium-distance, and long-distance imaging) by utilizing an array of microlenses with different focal lengths. This eliminates the need for multiple separate cameras or lens systems.
2Adaptability or versatility
If microlenses with different focal lengths are used for short-distance, medium-distance, and long-distance imaging, then multiple distance ranges are covered, but viewing angles differ causing resolution deterioration
Solution Approach 1:
The patent incorporates a processor that analyzes images captured by multiple microlenses and performs computational processing to correct viewing angle differences and resolve resolution issues. The processor synthesizes information from different microlenses to generate high-resolution images across all distance ranges.
Solution Approach 2:
The patent changes the optical parameters (focal lengths) of individual microlenses to optimize their performance for specific distance ranges. By carefully selecting and designing microlenses with different focal lengths, the system achieves both wide distance coverage and maintains high resolution through parameter optimization.
3Reliability
If a global shutter image sensor is used, then image distortion from rolling shutter effect is eliminated, but manufacturing cost increases and noise increases in dark areas
Solution Approach 1:
The patent uses a rolling shutter image sensor, which is a more cost-effective and simpler component compared to global shutter sensors. By combining this with computational processing, the system achieves acceptable image quality without the high manufacturing cost and complexity of global shutter sensors.
Solution Approach 2:
The patent replaces the mechanical/optical complexity of a global shutter system with a rolling shutter sensor combined with computational processing. This substitution reduces manufacturing cost and simplifies the hardware while maintaining functional effectiveness through software-based image processing.
4Ease of manufacture
If a rolling shutter image sensor is used, then manufacturing cost is reduced, but image distortion occurs due to rolling shutter effect
Solution Approach 1:
The patent uses computational processing to detect and correct rolling shutter distortion. By analyzing the temporal and spatial characteristics of images captured by the rolling shutter sensor, the processor applies correction algorithms to eliminate or reduce distortion effects.
Solution Approach 2:
The patent changes the processing parameters and algorithms used to handle rolling shutter images. By optimizing exposure timing, readout sequences, and computational correction parameters, the system minimizes distortion while maintaining the cost advantages of rolling shutter sensors.
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 ultrathin camera device achieves clear imaging at various distances without focus issues, reduces image distortion, and enables multifunctional applications like microscope imaging and high-speed imaging, while being cost-effective and suitable for small devices.
Implementation Method 1
an optical module including a microlens array in which microlenses are arranged, an image sensor that outputs electrical image signals by sensing light coming through the microlens array
Implementation Method 2
a pinhole array layer that transmits light coming through the transparent substrate to the microlens array through pinholes filled with transparent material
Implementation Method 3
an image sensor that outputs electrical image signals by sensing light coming through the microlens array
Data Source
AI summary
An ultrathin camera device is provided. The ultrathin camera device comprises an optical module including a microlens array in which microlenses are arranged, an image sensor that outputs electrical image signals by sensing light coming through the microlens array, spacers that form a focal length by separating the optical module from the image sensor, and a processor that outputs a final image by reconstructing array images generated from the image signals with a designated imaging process depending on a distance at which the object is located. Here, each microlens convexly protrudes toward the image sensor.