Seven-Lens Optical System with Adjustable Aperture for Compact Wide-Angle Imaging
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Solution Overview
Problem
The challenge of miniaturizing optical systems with adjustable apertures while maintaining good imaging quality and a large field of view is not adequately addressed in existing technologies, particularly in mobile electronic devices.
Innovation Solution
An optical system with seven lenses, each with specific refractive powers and surface configurations, including an adjustable aperture, is designed to satisfy certain conditional expressions that balance field of view, aperture range, and total lens length, ensuring miniaturization and high imaging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adjustable aperture system and multiple lenses are combined, then imaging quality and aperture adjustability are improved, but optical system volume increases
Solution Approach 1:
The patent implements a compact optical system where seven lenses are arranged in a nested configuration along the optical axis. The lenses are positioned closely together with minimized spacing, creating a nested doll-like structure where each lens is embedded within the overall optical assembly. This nesting approach allows multiple lenses with different refractive powers to be integrated in a space-efficient manner, achieving good imaging quality without proportionally increasing the optical system volume.
Solution Approach 2:
The patent utilizes aspheric surfaces on the lenses to correct optical aberrations in a different dimensional approach. By employing aspheric coefficients and complex surface geometries rather than simple spherical surfaces, the system achieves superior imaging quality and aberration correction without requiring additional lens elements that would increase volume. This dimensional change in surface geometry allows compact design while maintaining high imaging performance.
2Area of moving object
If field of view angle is increased, then wide angle imaging is improved, but optical system complexity increases
Solution Approach 1:
The patent achieves a wide field of view of 80 degrees or more by carefully selecting and optimizing specific optical parameters including the refractive powers of each lens, the spacing between lenses, and the aspheric coefficients of lens surfaces. By changing these parameters within constrained ranges rather than adding complex optical elements, the system expands the field of view while controlling overall complexity. The conditional expressions provided in the patent define specific parameter ranges that enable wide-angle imaging with a compact seven-lens configuration.
Solution Approach 2:
The optical system is segmented into seven distinct lens elements, each with specific refractive powers (positive or negative) and surface configurations. This segmentation allows the wide field of view to be achieved through the cumulative effect of multiple specialized lens elements working together, rather than requiring a single complex lens. Each lens segment contributes to correcting specific aberrations and expanding the field of view, distributing the complexity across manageable segments.
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 achieves a compact design with a wide field of view, adjustable aperture, and improved illumination, suitable for various lighting conditions, while enhancing imaging quality across the entire field of view.
Implementation Method 1
The first lens has positive refractive power, with the object side surface being convex near the optical axis and the imaging side surface being concave near the optical axis, which is conducive to the convergence of light in a wide field of view
Implementation Method 2
The second lens has negative refractive power, which helps correct the aberrations produced by the previous lens
Implementation Method 3
the object side surface of the fourth lens being convex near the optical axis and the imaging side surface of the fourth lens being concave near the optical axis, which is conducive to correcting the distortion, spherical aberration and astigmatism produced by the previous group of lenses
Implementation Method 4
The seventh lens has negative refractive power, with the object side surface being convex near the optical axis and the imaging side surface being concave near the optical axis, which can shorten the total length and correct aberrations, while suppressing the angle of light exit
Data Source
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AI summary
An optical system (10), from an object side to an imaging side along an optical axis (101), sequentially includes an adjustable aperture (STO) for adjusting an aperture size, a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), a fifth lens (L5), and a sixth lens (L6). The first and sixth lenses (L1, L6) have positive refractive power, the second, fifth, and seventh lenses (L2, L5, L7) have negative refractive power, the third and fourth lenses (L3, L4) have refractive power. Object side surfaces (S1, S7, S11, S13) of the first, fourth, sixth, and seventh lenses (L1, L4, L6, L7) are convex near the optical axis (101), imaging side surfaces (S2, S8, S10, S14) of the first, fourth, fifth, and seventh lenses (L1, L4, L5, L7) are concave near the optical axis (101). The optical system (10) satisfies: 80°<FOV<90°, 33<FOV/(FNOmax-FNOmin)<38, and 1.2<TTL/ImgH<1.3.