Cemented Lens Group Zoom Lens Aberration Correction
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Solution Overview
Problem
Current zoom lenses for cameras face challenges in achieving both high image quality and compact size, with a need for improved optical performance to meet the demands of ultra-high image quality and smaller sizes for video and electronic still cameras.
Innovation Solution
A zoom lens configuration comprising a first negative lens group, a second positive lens group with three or more cemented lenses, and a third positive lens group, where the second lens group moves relative to the first lens group and the third lens group remains fixed during zooming, with specific focal length ratios and conditional expressions to optimize image quality and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a zoom lens uses more lens groups and elements to improve image quality, then optical performance is improved, but the lens size and complexity increase
Solution Approach 1:
The patent combines multiple lens elements into cemented lens groups, where multiple lenses are joined together to function as a single unit. This merging approach allows the lens to achieve high optical performance through the combined power of multiple elements while maintaining a compact overall structure, as the cemented groups occupy less space than separate movable elements would require
Solution Approach 2:
The zoom lens is designed with three lens groups that can perform multiple functions: the first lens group handles wide-angle to intermediate zooming, the second lens group (with cemented lenses) handles intermediate to telephoto zooming and aberration correction, and the third lens group handles telephoto focusing. This multi-functional design allows a single lens system to achieve various focal lengths and image qualities without requiring separate dedicated lenses for each function, thereby reducing overall lens size
2Manufacturing precision
If the lens structure is made more complex to correct aberrations, then image quality is improved, but device complexity increases
Solution Approach 1:
The lens is divided into three distinct lens groups with specific functions: the first lens group (negative power) handles wide-angle to intermediate zooming, the second lens group (positive power with cemented lenses) handles intermediate to telephoto zooming and aberration correction, and the third lens group (positive power) handles telephoto focusing. This segmentation allows each group to be optimized for its specific function, making the overall system more manageable and easier to manufacture despite the complexity of aberration correction requirements
Solution Approach 2:
The patent employs cemented lens groups where multiple lens elements with different materials and properties are joined together. These composite lens structures combine the advantages of different glass types (different refractive indices and dispersion characteristics) to correct various types of aberrations simultaneously, achieving high image quality without requiring an excessively complex structure with many separate elements
3Volume of moving object
If the lens is designed for compact size, then the camera size is reduced, but optical performance may deteriorate
Solution Approach 1:
By merging multiple lens elements into cemented groups, the patent achieves high optical performance within a compact form factor. The cemented lenses provide the necessary optical power and aberration correction in a space-efficient manner, allowing the lens to deliver ultra-high image quality while maintaining a small overall size that fits within compact camera designs
Solution Approach 2:
The lens design applies different optical characteristics to different regions and groups: the first lens group uses negative power elements for wide-angle coverage, the second lens group uses cemented positive power elements for aberration correction and intermediate zooming, and the third lens group uses positive power elements for telephoto focusing. This localized optimization of optical properties allows each region to contribute to overall performance while maintaining compact dimensions
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 results in a compact and ultra-high image quality zoom lens that effectively corrects aberrations and supports larger and higher-resolution image sensors, maintaining excellent image forming performance across focal lengths.
Implementation Method 1
a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power, and a third lens group G3 having positive refractive power
Data Source
AI summary
A zoom lens having, in order from the object, a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power, and a third lens group G3 having positive refractive power, wherein the second lens group G2 is constituted only by three or more cemented lenses.