Wide-Angle Lens Group Aberration Correction
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Solution Overview
Problem
Conventional optical systems with wide angles of view face limitations in achieving optimal optical performance, particularly in terms of refractive power distribution and aberration correction, leading to subpar image quality and increased system size.
Innovation Solution
The optical system comprises a first lens group with at least two negative lenses, a positive lens, and a back-side negative lens, arranged with specific focal length and distance conditions to achieve a wide angle of view while optimizing refractive power and reducing aberrations, including field curvature, coma, and lateral chromatic aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional optical system configurations are used to achieve wide angle of view, then the angle of view is widened, but optical performance deteriorates due to improper refractive power distribution and uncorrected aberrations
Solution Approach 1:
The first lens group is segmented into multiple lens elements with specific focal lengths arranged in a predetermined sequence (negative, positive, negative). This segmentation allows each element to contribute differently to the overall refractive power distribution, enabling wide angle of view while maintaining proper power distribution and correcting aberrations individually and collectively
Solution Approach 2:
Each lens element within the first lens group is assigned specific local optical properties (focal length, refractive power) that differ from other elements. The negative lenses provide specific refractive functions while the positive lens provides complementary functions, creating local quality variations that collectively achieve both wide angle of view and proper aberration control
2Adaptability or versatility
If refractive power is increased to achieve wide angle of view, then angle of view is widened, but system size increases
Solution Approach 1:
The invention specifies precise parameter relationships through conditional expressions: the ratio of focal lengths between lens elements (e.g., |f11/f12| between 0.5 and 2.0), the ratio of focal length to maximum image height (|f1|/ymax between 1.0 and 3.0), and the ratio of distances between lenses to focal lengths (D12/|f11| between 0.1 and 0.6). These parameter changes enable compact sizing while achieving wide angle of view through optimized refractive power distribution rather than simply increasing overall system size
3Reliability
If lens elements are added to correct aberrations, then aberration correction is improved, but device complexity increases
Solution Approach 1:
The first lens group is segmented into a specific sequence of three lens elements (negative, positive, negative) with defined focal length relationships. This segmentation provides sufficient degrees of freedom to correct multiple aberration types (spherical, coma, astigmatism, field curvature, distortion) without requiring excessive numbers of elements, thus balancing correction capability with structural simplicity
Solution Approach 2:
Each lens element in the first lens group serves multiple functions simultaneously: the negative lenses contribute to wide angle of view, provide negative refractive power for aberration balancing, and participate in correcting various aberrations. The positive lens provides positive refractive power while also contributing to aberration correction. This multi-functionality reduces the need for additional dedicated correction elements, simplifying the overall structure
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 the optical performance by achieving a wider angle of view with improved refractive power distribution, effectively correcting aberrations and reducing system size, thereby providing better image quality and compactness.
Implementation Method 1
an optical system includes, sequentially from an object side, a first lens group, an aperture stop, and a second lens group, the first lens group includes, sequentially from the object side, at least two negative lenses, a positive lens, and a back-side negative lens
Data Source
AI summary
An optical system and an optical apparatus that have a wide angle of view and favorable optical performance and a method for manufacturing the optical system are provided. An optical system OL used for an optical apparatus such as a camera 1 includes, sequentially from an object side, a first lens group G1, an aperture stop S, and a second lens group G2, first lens group G1 includes, sequentially from the object side, at least two negative lenses (for example, negative lenses L1n1 and L1n2), a positive lens (for example, a positive lens L1p1), and a back-side negative lens (for example, a negative lens L1nr), and the optical system OL satisfies a condition expressed by a predetermined conditional expression.