Wavefront Detector Shadow Caster IC Substrate
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Solution Overview
Problem
Conventional digital cameras do not capture wavefront angle or phase information, limiting their ability to provide a complete representation of an illuminated scene, which is essential for applications like postprocessing and hologram generation.
Innovation Solution
A wavefront detector using shadow casters on an integrated circuit substrate to measure wavefront angles and absolute phase differences, offering improved sensitivity and dynamic range by varying shadow caster heights and incorporating light mixers for phase difference analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If micro lenses are used in a Shack-Hartman wavefront detector, then wavefront angle detection capability is achieved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts the wavefront detection function from the complex micro lens array system and implements it using a simplified mask structure with transparent and opaque regions. The mask is placed directly over the sensor array, eliminating the need for micro lenses while maintaining the ability to detect wavefront angles through selective light blocking and pattern analysis.
Solution Approach 2:
The patent replaces the mechanical/optical micro lens system with a static mask pattern system. Instead of using physical micro lenses to focus and deflect light for wavefront detection, the invention uses a fixed mask with specific transparent and opaque regions that create shadow patterns on the sensor, simplifying the mechanical complexity while achieving the same measurement function.
2Measurement precision
If shadow casters of different heights are used, then wavefront angle sensitivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies different shadow caster heights in different regions of the detector array. Rather than requiring all shadow casters to have identical heights, the invention uses varied heights locally to optimize sensitivity for different wavefront angle ranges, allowing the system to handle both small and large angle detections effectively while reducing overall manufacturing precision constraints.
Solution Approach 2:
The patent changes the height parameter of shadow casters to optimize detection sensitivity. By varying the height of shadow casters across different regions, the system can adjust its sensitivity characteristics to match different operational requirements, improving overall measurement capability while accommodating manufacturing tolerances.
3Device complexity
If conventional digital cameras are used, then device simplicity is maintained, but wavefront information is lost
Solution Approach 1:
The patent merges conventional digital camera technology with wavefront detection capabilities by integrating a mask structure and specialized processing into the existing camera architecture. The sensor array and processing system handle both conventional imaging and wavefront analysis simultaneously, allowing the same device to capture both intensity information and wavefront angle/phase information without requiring completely separate systems.
Solution Approach 2:
The patent makes the digital camera system multi-functional by enabling it to perform both conventional photography and wavefront detection. The same sensor array and processing circuitry are used for both capturing standard images and analyzing wavefront characteristics, allowing a single device to serve multiple purposes and eliminate the need for separate specialized instruments.
4Measurement precision
If high shadow caster heights are used, then sensitivity to small wavefront angles is improved, but detection range for large angles is reduced
Solution Approach 1:
The patent divides the detector into multiple regions, each with shadow casters optimized for different angle ranges. Some regions use taller shadow casters for high sensitivity to small angles, while other regions use shorter shadow casters for broader angle coverage. This segmentation allows the overall system to detect wavefront angles across a wide range with appropriate sensitivity in each region.
Solution Approach 2:
The patent creates a dynamic detection system where different regions of the sensor array can be selectively activated or weighted based on the expected wavefront angle range. The system can adaptively adjust which regions are used for detection depending on the scene being captured, optimizing sensitivity for the current operational conditions while maintaining broad overall coverage.
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
Enables accurate wavefront angle and phase detection, avoiding information loss at high angles and providing a more complete description of the scene, suitable for various applications including image recognition and hologram generation.
Implementation Method 1
A set of shadow casters is provided where each shadow caster is associated with a group of at least two sensor elements to selectively shade different sensor elements of that group as a function of the wavefront angle
Implementation Method 2
the shadow casters may be combined with integrated circuit light mixers generating constructive and destructive interference between light received at adjacent pixels to deduce absolute phase difference
Data Source
AI summary
A wavefront sensor system suitable for integration into an integrated circuit light detector may provide for wave angle sensors having varying functional relationships between the wave angle and signal to provide improved dynamic range. These wave angle sensors may be combined with integrated circuit phase angle sensors for a more complete analysis of the waveform.