Imaging Lens with Segmented Groups for Wide Angle View
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Solution Overview
Problem
Existing imaging lenses that achieve miniaturization while being compatible with large imaging elements do not provide a wide enough angle of view, necessitating further miniaturization and optical performance enhancement.
Innovation Solution
An imaging lens configuration comprising a first positive lens group, a stop, and two positive lens groups with specific refractive power distributions and lens arrangements, including negative and positive lenses, to achieve a wide angle of view while maintaining compactness and high optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a lens system is proportionately enlarged to become compatible with a large imaging element, then the imaging element compatibility is improved, but the total length of the lens system becomes long
Solution Approach 1:
The lens system is divided into multiple lens groups (first lens group with positive refractive power, second lens group with negative refractive power, third lens group with positive refractive power) that can move independently relative to each other. This segmentation allows each group to contribute differently to the overall optical function, enabling the system to maintain a compact total length while being compatible with large imaging elements.
Solution Approach 2:
The patent employs a focusing mechanism where the second lens group (with negative refractive power) moves along the optical axis relative to the first and third lens groups. This dynamic adjustment capability allows the lens system to maintain focus across different object distances while keeping the overall structure compact, resolving the contradiction between imaging element compatibility and total length.
2Length of stationary object
If the lens system is miniaturized to achieve compactness, then the total length is reduced, but the angle of view becomes insufficient
Solution Approach 1:
The patent achieves a wide angle of view in a compact lens system by carefully controlling the refractive powers of individual lens groups and their relative positions. Specifically, the negative refractive power of the second lens group and the positive refractive power of the first and third lens groups are balanced according to specific conditional formulas, enabling a wide angle of view without increasing the total length.
Solution Approach 2:
The lens system uses a composite structure with lens groups having different refractive powers (positive and negative) arranged in a specific configuration. This composite optical design allows the system to achieve both compactness and a wide angle of view by combining the optical effects of multiple lens groups with opposing refractive powers.
3Length of stationary object
If the lens system is miniaturized further to achieve compactness, then the total length is reduced, but the optical performance deteriorates
Solution Approach 1:
The patent assigns specific optical functions to different lens groups: the first lens group with positive refractive power for initial light convergence, the second lens group with negative refractive power for divergence and focusing adjustment, and the third lens group with positive refractive power for final image formation. This local optimization of optical quality in each group maintains high overall optical performance despite the compact total length.
Solution Approach 2:
The patent establishes conditional formulas that define the relationships between the focal lengths and refractive powers of different lens groups. These formulas act as design constraints that ensure optimal optical performance is maintained throughout the miniaturization process, providing a form of design feedback that prevents performance deterioration.
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 configuration allows for a compact imaging lens with a wide angle of view and favorable optical performance, compatible with large imaging elements, effectively addressing the need for further miniaturization and improved optical capabilities.
Implementation Method 1
a first lens group having a positive refractive power as a whole; a stop; a second lens group having a negative refractive power as a whole; and a third lens group having a positive refractive power as a whole
Data Source
AI summary
An imaging lens includes, in order from the object side to the image side, a positive first lens group, a stop, a positive second lens group, and a positive third lens group. The first lens group includes, consecutively in order from the most object side thereof, a negative lens and a positive lens. The second lens group is of a three lens configuration and includes a positive lens and a negative lens. The third lens group includes, consecutively in order from the most object side thereof, a negative lens and a positive lens. The imaging lens satisfies Conditional Formula (1): 0<f1/f2<2, which is related to the focal length f1 of the first lens group and the focal length f2 of the second lens group.