Matrix Pixel Focus Detection Device Parallax Resolution
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Solution Overview
Problem
Existing focus detection devices face challenges in achieving both high accuracy and speed due to the increased number of pixels, which often results in decreased focus detection speed and accuracy limitations.
Innovation Solution
A focus detection device incorporating a field lens, secondary image forming lenses, and a photoelectric conversion device with a matrix arrangement of pixels, control lines, and output lines, allowing for simultaneous focus detection in multiple directions through divided regions and shared signal processing units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels is increased to improve focus detection accuracy, then measurement precision is improved, but focus detection speed decreases
Solution Approach 1:
The pixel region is divided into multiple divided regions, with each region containing focus detection region pairs for detecting parallax in different directions. This segmentation allows parallel processing of focus detection across multiple directions simultaneously, improving detection speed while maintaining accuracy through the use of multiple pixels in each divided region
Solution Approach 2:
The patent transitions from linear sensor arrangements to a two-dimensional matrix arrangement of pixels organized in rows and columns. This dimensional change enables the formation of multiple focus detection region pairs that can detect parallax in both horizontal and vertical directions simultaneously, resolving the contradiction between accuracy and speed
2Measurement precision
If linear sensors are arranged in a staggered manner to improve focus detection accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The matrix-arranged pixels serve multiple functions: they form focus detection region pairs for horizontal parallax detection, vertical parallax detection, and can be selectively activated through control lines. This multi-functionality eliminates the need for complex staggered arrangements while achieving the same accuracy benefits through systematic row and column control
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 enhances focus detection accuracy and speed by enabling efficient signal readout and parallax detection across multiple directions, improving the overall performance of the focus detection system.
Implementation Method 1
each of the plurality of pixels includes a photoelectric converter
Data Source
AI summary
A focus detection device includes a field lens, a secondary image forming lens configured to capture a light flux from the field lens and to form a pair of images from light fluxes from different pupil positions, and a photoelectric conversion device including a pixel region including at least one focus detection region pair that detects the pair of images. The photoelectric conversion device includes pixels arranged in the pixel region in a matrix. The photoelectric conversion device includes control lines each supplying control signal to at least a part of pixels on a corresponding row, and output lines each receiving a signal from at least a part of pixels on a corresponding column. At least a pair of the pixels connected to a common control line or a common output line form the at least one focus detection region pair and output signals to be used for focus detection.