Eight-Lens Zoom Optical System with Aspheric Aberration Control
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Solution Overview
Problem
Conventional optical systems face challenges in achieving a balance between high image quality, low sensitivity, proper aperture size, miniaturization, and a desirable field of view, particularly in electronic devices with advanced semiconductor technology.
Innovation Solution
An image capturing lens system comprising four lens groups with eight lens elements, where the refractive powers and axial distances between groups are optimized to achieve a zooming process, including a long-focal-length end and a short-focal-length end, with specific conditions on Abbe numbers, refractive indices, and distances to ensure balanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lens elements is increased to improve image quality, then image quality is improved, but device complexity and size increase
Solution Approach 1:
The lens system is divided into four lens groups (G1, G2, G3, G4) with specific refractive power configurations. This segmentation allows each group to contribute differently to image quality while maintaining overall system compactness. The first lens group has positive refractive power, the second has negative refractive power, and the third and fourth have positive refractive power, creating a balanced optical system that achieves high image quality without excessive complexity.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements with specifically designed surface shapes characterized by inflection points. By changing the geometric parameters of the lens surfaces (using aspheric coefficients in surface equations), the system achieves superior image quality correction for aberrations without adding more lens elements, thus avoiding increased device complexity.
2Adaptability or versatility
If the focal length is increased to improve zoom ratio, then zoom ratio is improved, but the axial distance and system length increase
Solution Approach 1:
The lens groups are designed to move relative to each other along the optical axis during zooming operations. The second and third lens groups have positive movement amounts while the first and fourth have negative movement amounts, creating a dynamic zooming mechanism. This dynamic arrangement allows the system to achieve a wide zoom ratio (0.53 to 2.60) while maintaining a compact axial distance through coordinated movement of multiple lens groups.
Solution Approach 2:
The patent achieves a telephoto-type lens system configuration where the optical path is folded back on itself. By positioning the second lens group with negative refractive power after the first positive group, and continuing this alternating pattern, the system creates a nested-like structure where light travels through compact, overlapping optical paths, reducing the overall axial distance while maintaining long focal length capability.
3Use of energy by moving object
If the aperture size is increased to improve light gathering capability, then light gathering capability is improved, but sensitivity and miniaturization are compromised
Solution Approach 1:
The patent designs each lens group with specific local optical properties tailored to its position in the system. The first lens group has positive refractive power for light gathering, the second has negative refractive power for aberration correction, and the third and fourth have positive refractive power for focusing. This local optimization of optical properties allows the system to achieve high light gathering capability while maintaining compact dimensions and simple aperture control.
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 system enhances image quality, zoom ratio, and compactness while maintaining high image quality across varying focal lengths, addressing the limitations of conventional optical systems.
Implementation Method 1
The first lens element has positive refractive power, the second lens element has negative refractive power
Data Source
AI summary
An image capturing lens system includes four lens groups which include eight lens elements. The four lens groups are, in order from an object side to an image side: first, second, third and fourth lens groups. The eight lens elements are, in order from the object side to the image side: first, second, third, fourth, fifth, sixth, seventh and eighth lens elements. The first and second lens elements respectively have positive and negative refractive power. At least one lens element in the second through fourth lens groups has an inflection point. A focal length of the image capturing lens system is varied by changing axial distances between the four lens groups in a zooming process. The second lens group is moved relative to the first lens group along an optical axis in the zooming process. The image capturing lens system has a long-focal-length end and a short-focal-length end.