Five-Lens Optical Imaging Assembly for Compact Aberration Control
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Solution Overview
Problem
The challenge lies in achieving high image quality and miniaturization of optical imaging lens assemblies for portable electronic products, particularly smartphones, while ensuring compatibility with advanced photosensitive elements like CCD and CMOS, and maintaining a balance between image quality and compact size.
Innovation Solution
The optical imaging lens assembly is designed with a specific configuration of five lenses, each with defined refractive powers and surface types, including aspheric surfaces, and optimized parameters such as focal lengths, radii of curvature, and thicknesses to achieve a balanced distribution of refractive powers, controlling aberrations and ensuring compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the optical imaging lens assembly is miniaturized to meet portable electronic product requirements, then the size is reduced, but image quality deteriorates
Solution Approach 1:
The optical imaging lens assembly is divided into five separate lens elements (first lens to fifth lens) with different refractive powers and surface configurations. Each lens element contributes differently to the overall optical function, allowing the system to achieve high image quality while maintaining a compact form factor suitable for portable electronic products.
Solution Approach 2:
Different lens elements are designed with specific local characteristics: the first lens has an convex image-side surface, the third lens has a concave image-side surface, and the fourth lens has a convex image-side surface. Aspheric surfaces are applied to specific lenses (first, third, and fourth lenses) to locally correct aberrations. This localized optimization of optical properties enables high image quality in a miniaturized assembly.
2Manufacturing precision
If the refractive power distribution is optimized to improve image quality, then aberrations are reduced, but the design complexity increases
Solution Approach 1:
The patent establishes specific parameter ranges and relationships to control aberrations: the effective focal length ratio f2/f3 is constrained to 1.0-2.0, the total effective focal length f is limited to 1.5-3.0mm, and the focal length ratio f45/f is set to 1.5-2.5. These parameter constraints provide a systematic approach to aberration control while managing design complexity through quantitative guidelines.
Solution Approach 2:
Aspheric surfaces are applied to the first, third, and fourth lenses to correct spherical aberrations and other optical imperfections. The aspheric profiles provide superior aberration control compared to traditional spherical surfaces, enabling high image quality in the miniaturized lens assembly without proportionally increasing design complexity.
3Illumination intensity
If the aperture is increased to improve light gathering ability, then the aperture size is enlarged, but the lens assembly size increases
Solution Approach 1:
The patent achieves large aperture with compact size by optimizing the three-dimensional arrangement and refractive power distribution of the five lens elements. The total effective focal length is constrained to 1.5-3.0mm while maintaining a relatively large entrance pupil, utilizing the depth dimension and strategic lens positioning to decouple aperture size from overall assembly volume.
Solution Approach 2:
The optical system is designed with flexible spacing between lens elements and adjustable refractive power distribution across the five lenses. This dynamic configuration allows the system to optimize light gathering ability while maintaining a compact form factor, adapting the optical path to achieve large aperture effects without proportionally increasing the lens assembly volume.
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 results in an optical imaging lens assembly with small wide-angle, large aperture, low sensitivity, and miniaturization, providing good image quality and improved manufacturability, while effectively reducing spherical aberrations and enhancing image clarity.
Implementation Method 1
a first lens having positive refractive power or negative refractive power, an image-side surface of the first lens is convex; a second lens having positive refractive power or negative refractive power; a third lens having positive refractive power, an image-side surface of the third lens is concave; a fourth lens having positive refractive power or negative refractive power, an image-side surface of the fourth lens is convex
Data Source
AI summary
The present disclosure discloses an optical imaging lens assembly including, sequentially from an object side to an image side along an optical axis, a stop; a first lens having refractive power and a convex image-side surface; a second lens having refractive power; a third lens having positive refractive power and a concave image-side surface; a fourth lens having refractive power and a convex image-side surface; and a fifth lens having refractive power. An effective focal length f2 of the second lens and an effective focal length f3 of the third lens satisfy: 1.0<|f3/f2|<5.0. A center thickness CT4 of the fourth lens along the optical axis and an edge thickness ET4 of the fourth lens satisfy: 2.0<CT4/ET4<4.0. At least one of an object-side surface of the first lens to an image-side surface of the fifth lens is aspheric.