Flange Back Adjusting Lens for Chromatic Aberration Correction
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Solution Overview
Problem
Existing taking lenses fail to effectively correct image location shifts caused by on-axis chromatic aberration when switching between visible light and near infrared regions, especially when the television camera body undergoes changes in optical length, leading to incomplete correction of image location shifts.
Innovation Solution
A taking lens system that includes a focus lens, a flange back adjusting lens, a driving unit for moving the flange back adjusting lens, a correcting amount-storing unit, and a controlling unit to adjust the flange back lens position based on changes in both the taking lens and the television camera body's optical length, ensuring image location coincidence between visible light and near infrared regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the flange back adjusting lens position is corrected only based on the taking lens's optical length change, then the correction is simple to implement, but the image location shift cannot be fully resolved when the camera body also changes optical length
Solution Approach 1:
The system uses feedback by storing correction amounts in a correcting amount-storing unit and reading them based on the wavelength region being used. The controlling unit adjusts the flange back adjusting lens position based on this feedback information, ensuring accurate image location alignment in both visible light and near infrared regions without requiring complex real-time calculations.
Solution Approach 2:
The correction amounts for different wavelength regions are pre-calculated and stored in the correcting amount-storing unit before actual use. This preliminary action allows the system to quickly retrieve and apply the appropriate correction without performing complex calculations during operation, resolving the image location shift efficiently.
2Manufacturing precision
If the taking lens corrects image location shift independently without considering camera body optical length changes, then the lens design is simpler, but the correction becomes inaccurate when the camera body undergoes optical length changes
Solution Approach 1:
The correction amount is determined based on feedback information about both the taking lens's optical length change and the camera body's optical length change. This dual-feedback mechanism ensures that the correction accounts for variations in both components, achieving accurate image location alignment across different camera body configurations.
Solution Approach 2:
The system changes the correction parameter based on the wavelength region being used (visible light or near infrared). By storing and applying different correction amounts for different wavelength regions, the system adapts to the specific optical characteristics of each region, ensuring accurate image location alignment regardless of camera body variations.
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
The solution effectively resolves image location shifts even when the television camera body changes optical length, ensuring accurate image alignment across different wavelength regions by considering both the taking lens and camera body's optical length changes.
Implementation Method 1
an imaging face (hereinafter, referred to as image location) of a image-capturing element (CCD) of the television camera body is shifted by an on axis chromatic aberration caused by a difference in the wavelength region
Data Source
AI summary
A taking lens capable of being used for photographing by light in each of at least two wavelength regions including a first wavelength region and a second wavelength region is provided and include: the flange back adjusting lens; a storing unit that stores a correcting amount of the flange back adjusting lens in photographing by light in the second wavelength region; and the lens driving unit. When the taking lens is used in photographing by light in the first wavelength region, the lens driving unit moves the flange back adjusting lens to a set position adjusted at the flange back; and when the taking lens is used in photographing by light in the second wavelength region, the lens driving unit moves the flange back adjusting lens based on the correcting amount so that an image location in photographing by light in the second wavelength region coincides with an image location in photographing by light in the first wavelength region.