Zoom Lens System Aberration Compensation and Length Reduction
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Solution Overview
Problem
Conventional zoom lens systems for interchangeable lens cameras suffer from insufficient aberration compensation and increased overall length, making them bulky and heavy, which hinders the achievement of compact and lightweight designs with excellent optical performance.
Innovation Solution
A zoom lens system comprising a four-unit construction of negative and positive lens units, where the first lens unit has at least three elements with positive optical power, and specific refractive index and focal length conditions are met to optimize optical power distribution and aberration compensation, allowing for reduced overall length and improved optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional two-or-more unit construction of negative and positive lens units is used, then the zoom lens system can achieve variable magnification, but the aberration compensation is insufficient and the overall length cannot be reduced
Solution Approach 1:
The zoom lens system is divided into four distinct lens units (G1, G2, G3, G4) with alternating negative and positive optical powers. Each lens unit is further segmented into multiple lens elements with specific refractive indices and optical powers, allowing independent movement and optimization of each segment to achieve both compact length and effective aberration compensation across the zoom range.
Solution Approach 2:
Different lens elements within each lens unit are assigned specific local optical properties, including refractive indices (np>1.88 for positive power elements in G1), optical powers, and movement characteristics. This local optimization allows each element to contribute specifically to aberration compensation while maintaining overall system compactness.
2Reliability
If the first lens unit is composed of at least three lens elements with specific optical powers, then the optical performance and aberration compensation are improved, but the device complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for lens elements, including refractive index (np>1.88), optical power relationships (1.5p/fW), and movement distances. These parameter constraints optimize the balance between optical performance and manufacturing feasibility, ensuring high image quality while controlling system complexity through standardized design rules.
3Length of stationary object
If lens elements with high refractive index are used to reduce overall length, then the compactness is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise parameter ranges for lens elements, including refractive index (np>1.88), optical power relationships (1.5p/fW), and movement distances. These parameter constraints optimize the balance between optical performance and manufacturing feasibility, ensuring high image quality while controlling system complexity through standardized design rules.
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 results in a compact and lightweight zoom lens system with enhanced optical performance and effective aberration compensation, enabling a shorter overall length and reduced lens barrel length, while maintaining high imaging quality and preventing dust entry.
Implementation Method 1
a zoom lens system, in order from an object side to an image side, comprising a first lens unit having negative optical power, a second lens unit having positive optical power, a third lens unit having negative optical power, and a fourth lens unit having positive optical power
Data Source
AI summary
A zoom lens system, in order from an object side to an image side, comprising a first lens unit having negative optical power, a second lens unit having positive optical power, a third lens unit having negative optical power, and a fourth lens unit having positive optical power, wherein the first lens unit is composed of at least three lens elements, has at least one lens element having positive optical power, and moves along an optical axis in zooming, and the conditions: np>1.88 and 1.5<fp/fW<4.0 (np and fp: a refractive index to the d-line and a focal length of a lens element having the highest refractive index among the lens elements having positive optical power in the first lens unit, fW: a focal length of the entire system at a wide-angle limit) are satisfied; an interchangeable lens apparatus; and a camera system are provided.