Zoom Lens Configuration for Wide Angle View and Miniaturization
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Solution Overview
Problem
Existing zoom lenses face challenges in achieving a wider angle of view and smaller size while maintaining a high variable power ratio, as the thickness of lens elements increases due to the need to correct light ray inclination, hindering miniaturization.
Innovation Solution
A zoom lens configuration with a specific refractive power arrangement, including a first lens group with positive power, a movable second lens group with negative power, a fixed third lens group, a movable fourth lens group, and a fifth lens group, where the first lens group is formed by concave and convex lenses, and the second lens group by biconcave and biconvex lenses, satisfying conditional expressions to optimize refractive power and minimize size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If glass is filled in the space between the negative refractive power constituent element and the positive constituent element to decrease light ray inclination, then the angle of view is improved, but the thickness of the second lens is increased which hinders miniaturization
Solution Approach 1:
The patent removes the glass filling material from the space between lens elements, extracting the harmful factor (excessive light ray inclination correction) that was causing increased lens thickness. By taking out this intermediate glass material, the design achieves miniaturization while maintaining acceptable optical performance.
Solution Approach 2:
The patent changes the optical parameters by adjusting the refractive powers and positions of lens elements rather than relying on glass filling. Specifically, it optimizes the configuration of the first lens group (with five lenses) and the second lens group to achieve the desired angle of view without increasing overall lens thickness.
2Illumination intensity
If the first lens group is composed of five lenses to achieve wider angle of view and smaller size, then the angle of view is improved, but the device complexity is increased
Solution Approach 1:
The patent segments the optical system into five distinct lens groups with specific functions: the first lens group (five lenses) for wide-angle coverage, the second lens group for power variation, the third lens group for optical correction, the fourth lens group for focusing, and the fifth lens group for additional correction. This segmentation allows each group to be optimized independently while achieving the overall goal of wide angle of view with controlled complexity.
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 allows for a wider angle of view and smaller size while achieving a high variable power ratio, effectively correcting aberrations and maintaining image quality across different focal lengths.
Implementation Method 1
a first lens group having positive refractive power and having a position fixed at all times
Implementation Method 2
a second lens group having negative refractive power and made movable in a direction of an optical axis to vary power
Implementation Method 3
a cemented lens of a concave lens and a convex lens
Data Source
AI summary
Disclosed herein is a zoom lens including a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group. The zoom lens satisfies following conditional expressions (1) and (2), 0.03<H1′/f1<0.3 (1) 0.3<|f2|/√(fw·ft)<0.65 (2) where H1′ is an interval from a vertex of a surface nearest to the image side in the first lens group to a principal point on the image side of the first lens group (− denotes the object side, and + denotes the image side), f1 is focal length of the first lens group, f2 is focal length of the second lens group, fw is focal length of an entire lens system at a wide-angle end, and ft is the focal length of the entire lens system at a telephoto end.