Imaging Apparatus Pupil-Divided Pixel Array Focus Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing imaging apparatuses face challenges in simultaneously executing focus detection and live view display due to the need for densely arranging focus detection pixels, which can lead to difficulties in correctly executing pixel signal correction processes and matching pixel addition/displacement processes, resulting in decreased frame rates and increased data rates.
Innovation Solution
The imaging apparatus employs a pixel array with pairs of first and second pixels that receive light fluxes through a photography optical system by pupil-dividing, using separate adders and A/D converter circuits to generate and process signals for both display and focus detection, allowing for parallel operation during live view display and focus detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If focus detection pixels are densely arranged to secure focus detection performance, then focus detection precision is improved, but pixel signal correction process becomes difficult to execute correctly
Solution Approach 1:
The imaging element is segmented into distinct first pixel regions and second pixel regions, with each region having dedicated readout circuits. This segmentation allows focus detection pixels to be densely arranged in specific areas without compromising the correction process, as each region can be processed independently with appropriate correction applied.
Solution Approach 2:
Different regions of the imaging element are assigned different functions and processing characteristics. The first pixel regions are optimized for focus detection with dense arrangement, while the second pixel regions handle display functions. This local differentiation enables dense focus detection pixel arrangement while maintaining correct signal correction through region-specific processing.
2Adaptability or versatility
If focus detection is executed during live view, then focus detection capability is improved, but frame rate decreases and data rate increases
Solution Approach 1:
The pixel array is divided into first pixel regions dedicated to focus detection and second pixel regions dedicated to display. This segmentation enables independent readout of focus detection data and display data, allowing focus detection to be executed during live view without compromising frame rate, as each region has its own dedicated processing path.
Solution Approach 2:
The imaging element is designed with multi-functionality, where the same imaging element serves both focus detection and display purposes simultaneously. By providing separate readout circuits and processing paths for first and second pixel regions, the system achieves universal functionality without sacrificing performance in either function.
3Adaptability or versatility
If focus detection pixels are used for display, then pixel utilization is improved, but pixel signal output level becomes lower requiring correction process
Solution Approach 1:
The imaging element is divided into first pixel regions and second pixel regions with different characteristics. The second pixel regions provide higher output levels suitable for display, while the first pixel regions are optimized for focus detection. This local quality differentiation allows focus detection pixels to be used for display when needed while maintaining reliable signal levels through region-specific optimization.
Solution Approach 2:
The imaging element achieves universal functionality by allowing pixels to serve multiple purposes. Focus detection pixels can be utilized for both focus detection and display functions, with the system selecting appropriate pixel regions based on the required function, thereby improving overall pixel utilization while maintaining signal reliability.
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 simultaneous execution of live view display and focus detection without decreasing frame rates or increasing data rates, while allowing for optimal exposure settings and reducing pixel signal saturation, thereby improving focus detection precision.
Implementation Method 1
a pixel array in which a plurality pixels that generate electric charges based on incident light are arranged
Data Source
AI summary
An imaging apparatus includes a pixel array, a first adder, a second adder, a first A/D converter circuit, and a second A/D converter circuit. The pixel array includes a plurality of pairs of first pixels and second pixels. Each pair of the first pixel and the second pixel receives a light flux passing through a photography optical system by pupil-dividing the light flux. The first adder adds outputs of the first pixels and outputs of the second pixels. The second adder generates a first output by adding the outputs of the first pixels and generates a second output by adding the outputs of the second pixels. The first A/D converter circuit converts an output of the first adder to a digital signal. The second A/D converter circuit converts an output of the second adder to a digital signal.