Negative-Positive Zoom Lens Aberration Correction
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Solution Overview
Problem
Conventional negative-leading type zoom lens systems struggle to achieve both downsizing and excellent aberration correction simultaneously.
Innovation Solution
A zoom lens system comprising a first lens group with negative refractive power and a second lens group with positive refractive power, where the second lens group includes at least two cemented lenses with a positive lens on the object side and a negative lens on the image side, and the distance between the lens groups varies upon zooming, satisfying specific conditional expressions to optimize optical performance and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional negative-leading type zoom lens system design is used, then zooming capability is achieved, but downsizing and excellent aberration correction cannot be realized simultaneously
Solution Approach 1:
The zoom lens system is divided into multiple lens groups (first lens group with negative refractive power, second lens group with positive refractive power) that can move independently during zooming. This segmentation allows each group to be optimized for specific functions, enabling compact design while maintaining aberration correction capability.
Solution Approach 2:
Different regions of the lens system have different optical properties. The first lens group has negative refractive power for compactness, while the second lens group has positive refractive power for aberration correction. This local differentiation of optical characteristics resolves the contradiction between size and performance.
2Length of stationary object
If lens groups are positioned closer for downsizing, then compactness is improved, but aberration correction deteriorates
Solution Approach 1:
The distance between the first lens group and the second lens group is made variable rather than fixed. During zooming operations, the groups move relative to each other, dynamically adjusting the optical path to maintain aberration correction quality while achieving compact form factor at different focal lengths.
Solution Approach 2:
The lens system uses composite optical design combining positive and negative refractive power groups. This composite structure allows the system to achieve both compactness and precise aberration correction by leveraging the complementary properties of different lens group configurations.
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 enables excellent optical performance and compactness by balancing aberration correction and downsizing, while maintaining effective zooming capabilities.
Implementation Method 1
a first lens group G1 having negative refractive power, and a second lens group G2 having positive refractive power
Data Source
AI summary
A zoom lens system ZL installed in an electronic still camera 1 and the like comprising, in order from an object side: a first lens group G1 having negative refractive power; and a second lens group G2 having positive refractive power; the second lens group including at least two cemented lenses each of which includes a positive lens disposed to the object side and a negative lens disposed to an image side, a distance between the first lens group and the second lens group varying upon zooming from a wide-angle end state to a telephoto end state, thereby providing a zoom lens system having excellent optical performance, an optical apparatus equipped with the zoom lens system, and a method for manufacturing the zoom lens system.