Aspheric Lens Light Absorption Apodization Optical System
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Solution Overview
Problem
Existing optical systems fail to achieve a preferred light amount distribution in blurry images, where the light amount is gently reduced near the contour, leading to an emphasis on the contour of the blurry image, which is not desirable.
Innovation Solution
An optical system comprising a plurality of lenses, including an aspheric lens with a first aspheric surface and a light absorption portion with a second aspheric surface, where the light absorption portion has a transmissivity distribution that reduces transmissivity with increasing distance from the optical axis, and specific refractive index and aspheric sag amount ratios are maintained to achieve the apodization effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional optical system is used, then the structure is simple, but the light amount distribution in blurry images is not optimal (contour emphasis occurs)
Solution Approach 1:
The patent applies local quality by giving different transmissivity characteristics to different regions of the optical system. The light absorption portion has a specific transmissivity distribution that varies with distance from the optical axis, creating gentle light reduction near the contour of blurry images while maintaining other optical properties.
Solution Approach 2:
The patent uses composite materials by combining the aspheric lens material with a light absorption portion made of different material having specific transmissivity characteristics. This composite structure enables the apodization effect while maintaining structural integrity and optical performance.
2Illumination intensity
If an apodization effect is introduced to improve light amount distribution, then optical performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by carefully controlling the transmissivity distribution parameter of the light absorption portion and the aspheric sag amounts of both surfaces. By satisfying specific conditional expressions relating these parameters, the patent achieves the desired apodization effect while maintaining manufacturability through defined parameter ranges.
3Illumination intensity
If the light absorption portion has high transmissivity, then light amount is sufficient, but contour emphasis occurs in blurry images
Solution Approach 1:
The patent applies partial action by introducing a light absorption portion that provides just enough light reduction to achieve gentle contour transition in blurry images. The transmissivity is designed to be sufficient for the intended purpose (apodization) without being excessive, maintaining overall light amount while achieving the desired softening effect at contours.
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 optical system effectively imparts a gentle reduction in light amount near the contour of the blurry image, reducing asymmetry and enhancing the apodization effect, thereby improving the optical performance and image quality by compensating for variations in optical performance.
Implementation Method 1
a light absorption portion arranged on an optical axis and having thickness distribution in a direction perpendicular to the optical axis
Implementation Method 2
nG is a refractive index of the aspheric lens at a wavelength of 550 nm, nF is a refractive index of the light absorption portion at the wavelength of 550 nm
Data Source
AI summary
An optical system of the present invention includes a plurality of lenses inclusive of an aspheric lens having an aspheric surface. A light absorption portion having thickness distribution in a direction perpendicular to an optical axis of the optical system is provided on the optical axis. Here, a refractive index of the aspheric lens, a refractive index of the light absorption portion, an aspheric sag amount of the aspheric lens, an aspheric sag amount of the light absorption portion, a height of a position in the aspheric lens through which a marginal ray of an axial ray passes, and a height of a position in the light absorption portion through which the marginal ray of the axial ray passes are each appropriately set.