Zoom Lens Compact Size Aberration Control
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Solution Overview
Problem
Existing zoom lenses face challenges in achieving a compact size with a wide angle of view, high zoom ratio, and high optical performance while minimizing aberrations and lens thickness, particularly at the telephoto end.
Innovation Solution
A zoom lens configuration with specific refractive power arrangements and moving conditions for the first, second, and third lens units, where the first lens unit moves to the object side, the second lens unit moves to the image side, and the third lens unit moves to the object side, with conditional expressions governing the moving amounts and focal lengths to optimize the zoom ratio and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the refractive powers of lens units are increased to reduce the size of the entire zoom lens, then the lens thickness increases to ensure edge thickness, but it is difficult to sufficiently reduce the size of the entire zoom lens and the front-lens effective diameter increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive powers of individual lens units and their movement amounts during zooming. The conditional expressions (1) and (2) define specific ranges for these parameters, allowing the lens system to achieve compact size while maintaining appropriate lens thickness through optimized optical power distribution across multiple lens units.
2Volume of moving object
If the refractive powers of lens units are increased to reduce the size of the entire zoom lens, then the front-lens effective diameter increases, but it is difficult to sufficiently reduce the size of the entire zoom lens
Solution Approach 1:
The patent segments the zoom lens into multiple lens units with different refractive powers (positive and negative) that move independently during zooming. This segmentation allows the optical power to be distributed across several smaller components rather than concentrated in a single large lens, thereby reducing the front-lens effective diameter while achieving compact overall size.
3Volume of moving object
If the number of lenses is reduced to reduce the size of the entire zoom lens, then the lens thickness increases to ensure edge thickness, but it is difficult to sufficiently reduce the size of the entire zoom lens
Solution Approach 1:
The patent optimizes the refractive power parameters of each lens unit to achieve the right balance between lens thickness and overall size. By carefully selecting the refractive powers within specific ranges defined by the conditional expressions, the design reduces lens thickness while maintaining compact dimensions through efficient optical power distribution.
4Productivity
If the refractive powers of lens units are increased to achieve high zoom ratio, then aberrations such as chromatic aberration increase at the telephoto end, but high optical performance cannot be achieved
Solution Approach 1:
The patent divides the zoom lens into multiple lens units with alternating positive and negative refractive powers. This segmentation enables better control over aberrations at the telephoto end by distributing the optical power across multiple elements, allowing high zoom ratio to be achieved while maintaining high optical performance through coordinated movement of the segmented lens units.
5Adaptability or versatility
If a wide angle of view and high zoom ratio are achieved, then the lens configuration becomes complex, but compact size and high optical performance are difficult to achieve simultaneously
Solution Approach 1:
The patent achieves wide angle of view and high zoom ratio with controlled complexity by defining specific parameter ranges for refractive powers and movement amounts. The conditional expressions (1) and (2) provide precise control over the optical parameters, enabling the lens to deliver versatile imaging capabilities while maintaining a relatively simple and compact configuration through optimized parameter selection.
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 enables a compact zoom lens with a wide angle of view, high zoom ratio, and high optical performance over the entire zoom range, while maintaining a small front-lens effective diameter and reducing aberrations.
Implementation Method 1
During zooming from a wide angle end to a telephoto end, the first lens unit moves to the object side, the second lens unit moves to the image side, and the third lens unit moves to the object side
Implementation Method 2
a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power
Data Source
AI summary
A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a rear group including at least one lens unit. For zooming from a wide angle end to a telephoto end, the first lens unit moves to the object side, the second lens unit moves to the image side, and the third lens unit moves to the object side. Moving amounts of the first lens unit, the second lens unit, and the third lens unit for zooming from the wide angle end to the telephoto end and focal lengths of the second lens unit and the third lens unit are set based on predetermined conditions.