Miniature Zoom Lens with Segmented Refractive Power
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Solution Overview
Problem
Miniature zoom lenses face a challenge in achieving high optical performance while maintaining a small size, as increasing the number of lens groups improves zoom ratio but increases size and weight, and reducing lens groups compromises optical performance.
Innovation Solution
A zoom lens configuration with specific refractive power distributions and movements of lens groups (first, second, third, and fourth lens groups) along the optical axis, allowing switching between wide-angle, middle, and telephoto modes while maintaining a compact size and high optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If more lens groups are provided in the zoom lens to raise the zoom ratio and optical performance, then the zoom ratio and optical performance are improved, but the zoom lens becomes bigger and heavier
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive power distribution across lens groups and precisely controlling the movement distances of each lens group during zooming. By changing the parameters of refractive power and movement distance, the patent achieves high zoom ratio with fewer lens groups, thereby reducing weight while maintaining optical performance
Solution Approach 2:
The patent divides the zoom lens into four lens groups with specific refractive power characteristics (positive, negative, positive, positive). Each lens group is assigned a specific function and movement pattern, allowing the system to achieve complex zoom functionality through coordinated movement of segmented components rather than requiring more lens groups
2Adaptability or versatility
If more lens groups are provided in the zoom lens to raise the zoom ratio and optical performance, then the zoom ratio and optical performance are improved, but the zoom lens becomes bigger
Solution Approach 1:
The patent optimizes the movement distance parameters of each lens group to achieve high zoom ratio within a compact length. By precisely controlling how far each lens group moves during zooming, the patent extends the optical path efficiently without proportionally increasing the physical length of the lens
Solution Approach 2:
The patent employs dynamic movement of lens groups during zooming operation. The first, second, and third lens groups move along the optical axis in coordinated fashion, with their movement distances being dynamically adjusted based on the desired focal length, allowing the lens to achieve variable zoom ratio within a fixed compact structure
3Length of stationary object
If fewer lens groups are used in the zoom lens to reduce size, then the size is reduced, but the optical performance becomes poor
Solution Approach 1:
The patent compensates for the reduced number of lens groups by optimizing the refractive power parameters of each group and their movement distances. The specific refractive power distribution (positive, negative, positive, positive) and coordinated movement patterns enable the four-lens-group configuration to achieve optical performance comparable to systems with more lens groups
Solution Approach 2:
The patent assigns specific functional roles to each of the four lens groups, with the first lens group having positive refractive power, the second having negative refractive power, and the third and fourth having positive refractive power. This functional segmentation allows each group to contribute optimally to image quality, achieving high optical performance with fewer groups
4Weight of stationary object
If fewer lens groups are used in the zoom lens to reduce weight, then the weight is reduced, but the optical performance becomes poor
Solution Approach 1:
The patent optimizes the refractive power and movement distance parameters to achieve high optical performance with minimal lens groups. By precisely tuning these parameters, the patent reduces the need for additional lens groups that would increase weight, while maintaining image quality through efficient optical design
Solution Approach 2:
The patent divides the optical system into four functionally distinct lens groups with specific refractive power characteristics. This segmentation allows each group to perform its optimized function efficiently, achieving high optical performance with fewer total groups and thereby reducing overall weight
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 a miniature zoom lens with a high zoom ratio and high optical performance by optimizing lens group movements and refractive power distributions, achieving acceptable aberrations and maintaining a small size.
Implementation Method 1
The first lens group has positive refractive power, and includes at least two lenses, wherein one of the lenses has negative refractive power, and one of the lenses has positive refractive power. The second lens group has negative refractive power, and includes three lenses, wherein one of the lenses has positive refractive power, and the rest two lenses have negative refractive power.
Data Source
AI summary
A zoom lens of the present invention includes a first lens group, a second lens group, an aperture, a third lens group, a fourth lens group, and an image surface in sequence along an optical axis from an object side to an image side. The first lens group has positive refractive power, and includes at least two lenses. The second lens group has negative refractive power, and includes three lenses. The third lens group has positive refractive power, and includes at least two lenses. The fourth lens group has positive refractive power. The zoom lens is switched to a telephoto mode from a wide-angle mode by moving the first lens group toward the object side, moving the second lens group toward the image side, and moving the third lens group toward the object side.