Zoom Lens Optical Path Deflection for Compact Design
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Solution Overview
Problem
Conventional zoom lenses face challenges in achieving a wider angle of view and higher zoom ratio while maintaining compact size and high optical performance.
Innovation Solution
A zoom lens configuration comprising six lens groups with specific refractive powers and optical path lengths, including a first lens group with positive refractive power, a second lens group with negative refractive power, and a third lens group with positive refractive power, where the focal lengths and optical path lengths are optimized to satisfy certain conditional expressions, allowing for a compact design with a wider angle of view and high zoom ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a zoom lens is designed with a wider angle of view and higher zoom ratio, then the angle of view and zoom ratio are improved, but the lens size and complexity increase
Solution Approach 1:
The zoom lens is divided into six distinct lens groups (G1-G6) with specific refractive powers, where each group serves a particular function in the optical system. This segmentation allows independent optimization of each group's parameters to achieve both wide angle of view and high zoom ratio while controlling overall complexity
Solution Approach 2:
An optical element for deflecting the optical path by approximately 90 degrees is introduced into the system, changing the dimensional arrangement of the lens. This allows the lens to achieve compact form factor while maintaining the required optical performance for wide angle and high zoom ratio
2Adaptability or versatility
If a zoom lens is designed with a wider angle of view and higher zoom ratio, then the angle of view and zoom ratio are improved, but the lens physical size increases
Solution Approach 1:
The optical path deflecting element bends the light path by approximately 90 degrees, effectively reducing the longitudinal length of the lens assembly. This dimensional change allows the lens to achieve wide angle of view and high zoom ratio without proportionally increasing the overall lens volume
Solution Approach 2:
The six lens groups are arranged in a compact sequence with optimized spacing, where each group is positioned to minimize the overall lens length while maintaining the required optical path. The nested arrangement of lens elements within each group further reduces the lateral size
3Adaptability or versatility
If a zoom lens is designed with a wider angle of view and higher zoom ratio, then the angle of view and zoom ratio are improved, but the optical performance deteriorates
Solution Approach 1:
Each lens group is assigned a specific refractive power (positive or negative) and contains lens elements with tailored properties to correct specific types of aberrations. This local optimization of quality in each group ensures that overall optical performance is maintained despite the wide angle and high zoom ratio requirements
Solution Approach 2:
The patent specifies precise conditional expressions for the focal lengths of each lens group and the optical path length, optimizing these parameters to balance wide angle of view, high zoom ratio, and excellent optical performance. The parameters are carefully tuned to minimize aberrations across the zoom range
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 compact zoom lens with excellent optical performance, effectively correcting various aberrations and maintaining a high zoom ratio, suitable for digital still cameras.
Implementation Method 1
a zoom lens having an optical element, which can deflect an optical path about 90°
Implementation Method 2
a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power
Data Source
AI summary
A zoom lens ZL including an optical element P for deflecting an optical path, including, in order from an object: a first lens group G1 having positive refractive power; a second lens group G2 having negative refractive power; a third lens group G3 having positive refractive power; a fourth lens group G4 having positive refractive power; a fifth lens group G5 having negative refractive power; and a sixth lens group G6, wherein a conditional expression 0.10<fw/PL<0.45 is satisfied, where fw denotes a focal length of the zoom lens ZL in a wide-angle end state, and PL denotes an optical path length of the optical element P for deflecting the optical path.