Multi-Blade Diaphragm Ghost Reduction for Imaging Systems
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Solution Overview
Problem
Conventional ghost reduction technologies fail to effectively eliminate ghosts in imaging systems, especially under low-light conditions, leading to image quality deterioration.
Innovation Solution
A ghost reducing device with multiple diaphragm blades positioned near the pupil in the imaging optical system, which can adjust the size and position of an opening to block stray light, ensuring that return light is not reflected back into the system, thereby reducing ghost occurrences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a douser is disposed in the vicinity of the pupil position to block stray light, then ghost reduction is improved, but light transmission is reduced causing image quality deterioration in low-light conditions
Solution Approach 1:
The diaphragm is divided into multiple independently controllable blades instead of a single solid douser. This segmentation allows selective blocking of specific light paths while maintaining openness in other areas, enabling ghost reduction without excessive light loss.
Solution Approach 2:
Different regions of the diaphragm can be adjusted independently to have different degrees of opening. The diaphragm blades can be positioned to block light from specific directions (where ghosts originate) while allowing light from other directions to pass through, creating localized quality control.
2Object-affected harmful factors
If the aperture is restricted to a smaller value to remove harmful light, then ghost formation is reduced, but light intake is reduced affecting image quality
Solution Approach 1:
The diaphragm blades can be asymmetrically positioned to create non-uniform opening patterns. This allows the aperture to be shaped in a way that blocks asymmetric stray light paths (which cause ghosts) while maintaining sufficient total opening area for light intake.
Solution Approach 2:
The diaphragm blade positions are dynamically adjustable rather than fixed. The control unit can adjust the aperture shape and size in real-time based on imaging conditions, optimizing the balance between ghost reduction and light intake for different scenarios.
3Object-affected harmful factors
If a special douser blocks the majority of the pupil area to reduce ghosts, then ghost occurrences are minimized, but sufficient light cannot be secured in low-light conditions
Solution Approach 1:
Instead of using a single large blocking element, the system uses multiple smaller diaphragm blades that can be independently controlled. This allows blocking of specific problematic light paths while maintaining sufficient total open area for light transmission in low-light conditions.
Solution Approach 2:
The diaphragm structure serves multiple functions: it controls aperture size for light intake, shapes the aperture to block stray light paths, and can be dynamically adjusted for different imaging conditions. This multi-functionality eliminates the need for a dedicated large-area douser that would block excessive light.
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
Effectively reduces ghosts in high-luminance situations and maintains image quality under low-light conditions by securing sufficient light, minimizing hardware requirements and improving image recognition accuracy.
Implementation Method 1
multiple diaphragm blades which are formed in the vicinity of the pupil position in an imaging optical system and form at least one opening that lets light pass through
Implementation Method 2
it is reflected by the surface of a lens, the inner surface of a barrel, etc. and becomes stray light
Data Source
AI summary
[Subject(s)] To offer a ghost reducing device and an imaging device provided with it, a ghost reducing method, and an imaging optical system that can effectively reduce ghosts in a situation where ghosts can easily occur, and suppress deterioration in image quality in a situation where ghosts can hardly occur.[Means to Solve] A ghost reducing device includes multiple diaphragm blades that are formed in the vicinity of the pupil position in an imaging optical system and form at least one opening that lets light pass through, a diaphragm blade drive means that drives the diaphragm blades to adjust the size and/or position of the opening, and a control means that controls the driving of the diaphragm blades by the diaphragm blade drive means, wherein the control means controls the driving so that the diaphragm blades totally block the light in the symmetrical position to the opening with respect to the optical axis of the imaging optical system.