Optical Imaging Lens Assembly Compact Design
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Solution Overview
Problem
Conventional compact imaging lens assemblies face challenges in achieving better image quality and a large field of view while maintaining a compact form, as they either suffer from limited aberration correction or require increased size due to the number of lens elements.
Innovation Solution
An optical imaging lens assembly comprising three lens elements with specific refractive powers and surface curvatures, including a first lens with positive refractive power, a second with negative refractive power, and a third with negative refractive power, along with an aperture stop between the first and second lens elements, to reduce total track length and enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If two lens elements are used to reduce production cost, then manufacturing cost is reduced, but aberration correction capability becomes insufficient
Solution Approach 1:
The patent changes the refractive power parameters and surface curvature parameters of the three lens elements to achieve optimal aberration correction. Specifically, the first lens element has positive refractive power with specific curvature radii (R1, R2), the second has negative refractive power with specific curvatures, and the third has positive refractive power with specific curvatures, along with defined thickness ratios and focal length relationships
2Manufacturing precision
If three lens elements are used to improve image quality, then aberration correction is improved, but total track length increases making the system less compact
Solution Approach 1:
The patent optimizes the focal length parameter f and the thickness parameters CT1, CT2, CT3 of the three lens elements to achieve a balance between image quality and compact size. The specific parameter relationships (0.4 < CT1/f < 0.8, 0.2 < CT2/f < 0.6, 0.2 < CT3/f < 0.6) ensure that the total track length remains compact while maintaining good aberration correction capability through the triplet configuration
3Manufacturing precision
If more lens elements are added to correct aberration, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent assigns different local optical properties to each of the three lens elements: the first element has positive refractive power with specific surface curvatures for primary focusing, the second element has negative refractive power for aberration compensation, and the third element has positive refractive power for final image formation. This localized functional differentiation achieves comprehensive aberration correction with minimal elements
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 effectively reduces the total track length, improves image quality, and achieves a large field of view while maintaining a compact form, by balancing telecentric feature and wide field of view, and correcting aberrations.
Implementation Method 1
a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power having a concave object-side surface; and a third lens element with negative refractive power having a concave image-side surface
Data Source
AI summary
The present invention provides an optical imaging lens assembly comprising, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power having a concave object-side surface; and a third lens element with negative refractive power having a concave image-side surface, at least one of the object-side and image-side surfaces thereof being aspheric. With the aforementioned arrangement of lens elements, the total track length of the optical imaging lens assembly can be effectively reduced, the sensitivity of the optical system can be attenuated, a large field of view can be achieved and the image quality can be improved.