Image Sensor MLA Coding for Compact High-Resolution Reconstruction
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Solution Overview
Problem
Existing image capturing devices face challenges in reducing volume while maintaining sensitivity and resolution, particularly when using compact lenses, due to limitations in lens and sensor size and alignment.
Innovation Solution
The implementation of a multi-lens array (MLA) with a mask array between the imaging lens and sensing array, combined with a condensing lens array, allows for fractional alignment of lens and sensing elements, and a processor for image restoration through frequency domain processing to achieve high-resolution images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the lens decreases to reduce device volume, then the focal length decreases and device volume is reduced, but the sensitivity and resolution of the image sensor deteriorate
Solution Approach 1:
The patent divides the single lens into multiple lens elements (lens array) and the sensor into multiple sensing elements arranged in specific patterns. This segmentation allows each element to be smaller while collectively maintaining the resolution and sensitivity of the overall system, resolving the contradiction between reduced lens size and maintained image quality.
Solution Approach 2:
The patent introduces a mask array with coded aperture patterns that modulates light in the optical path between the lens array and sensor. This adds a dimensional layer of optical coding that enables high-resolution image reconstruction from multiple lower-resolution measurements, allowing smaller lenses to achieve high resolution through computational optics.
2Volume of moving object
If compact lenses are used to reduce device volume, then the focal length decreases, but alignment precision between lens and sensor elements becomes more difficult to maintain
Solution Approach 1:
The patent employs self-aligning mechanisms where the mask array and lens array are designed with corresponding periodic patterns that automatically align during assembly. The coded aperture patterns in the mask array correspond to the lens element arrangement, creating self-correcting alignment features that reduce manufacturing precision requirements.
Solution Approach 2:
The patent uses computational image processing and algorithms that can compensate for misalignment parameters. By changing from precise mechanical alignment to computational correction, the system tolerates larger alignment variations while maintaining image quality, thus reducing manufacturing precision requirements.
3Measurement precision
If a mask array is introduced to achieve high-resolution image reconstruction, then image resolution improves, but device complexity increases
Solution Approach 1:
The patent merges the mask array functionality with the existing lens array and sensor structure. The mask array is integrated into the optical path between the lens array and sensor, combining multiple optical functions (light modulation, spatial encoding) into a single compact component that does not significantly increase overall device complexity.
Solution Approach 2:
The patent replaces complex mechanical alignment and focusing mechanisms with a simpler mask array and computational image processing system. The coded aperture patterns in the mask array enable high-resolution reconstruction through software algorithms rather than requiring complex mechanical precision, reducing overall device complexity.
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 enables high-resolution image reconstruction by rearranging pixel positions based on overlapping light field information, reducing the device's focal length and volume while enhancing sensitivity and resolution.
Implementation Method 1
a plurality of two dimensionally arranged photoelectric conversion elements for converting incident light into electrical signals
Implementation Method 2
a color filter provided above the sensing array and configured to filter light of a portion of wavelength bands from light incident on each of the plurality of sensing elements
Implementation Method 3
a condensing lens array provided above the sensing array
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
An imaging device may code light, passing through an imaging optical lens arranged in a multi-lens array (MLA), and may transmit the light to a sensing element, and the sensing element may restore an image based on sensed information.