Five-piece Imaging Lens Assembly Compact Design
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Solution Overview
Problem
Traditional thin five-piece optical lens assemblies with fixed focus length struggle to balance imaging quality and optical system length, often resulting in longer total lengths due to the combination of lens elements with positive and negative refractive powers.
Innovation Solution
A five-piece imaging lens assembly is designed with specific refractive powers and surface configurations, including a first lens with positive power, a second with negative power, a third with refractive power, a fourth with positive power, and a fifth with negative power, featuring inflection points and convex or concave surfaces, optimized to reduce the total length while improving imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lens elements with positive and negative refractive powers are combined to increase back focus length, then imaging quality is improved, but total length of the optical system becomes longer
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, curvatures, and thicknesses of each lens element. Specifically, the first lens element has positive refractive power with specific curvature values, while the second and fifth lens elements have negative refractive powers. The parameters are carefully controlled within specific ranges to achieve compact total length while maintaining imaging quality through precise optical parameter optimization.
Solution Approach 2:
The patent uses composite material principles by combining lens elements with different refractive powers and material properties. The five lens elements are composed of materials with different refractive indices and Abbe numbers, creating a composite optical system that corrects aberrations and achieves compact design. The combination of positive and negative power elements with specific material properties enables both short total length and high imaging quality.
2Length of moving object
If lens elements are optimized for compact design, then total length is shortened, but imaging quality and aberration correction may deteriorate
Solution Approach 1:
The patent applies segmentation by dividing the optical system into five distinct lens elements, each with specific functions. The first lens element (positive power) handles primary focusing, the second lens element (negative power) corrects field curvature and astigmatism, the third lens element provides additional correction, the fourth lens element refines the optical path, and the fifth lens element (negative power) corrects spherical aberration and distortion. This segmentation allows compact design while maintaining comprehensive aberration correction.
Solution Approach 2:
The patent applies local quality by giving each lens element specific local characteristics tailored to its position and function in the optical system. Each element has customized curvature values, thickness, and refractive power optimized for its local role. For example, the first lens element has specific object-side and image-side curvatures optimized for light entry, while the fifth lens element has curvatures optimized for image plane correction, achieving high imaging quality in compact form.
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 assembly effectively shortens the optical lens assembly length while enhancing imaging quality by fine compensation for astigmatic field, distortion, and spherical aberration, meeting specific parameter relations for improved performance.
Implementation Method 1
a first lens element with positive refractive power and having convex object-side surface adjacent to the optical axis, a second lens element having concave object-side surface adjacent to the optical axis, a third lens element with refractive power adjacent to the optical axis, a fourth lens element with refractive power adjacent to the optical axis, and a fifth lens element with negative refractive power adjacent to the optical axis
Data Source
AI summary
The present disclosure illustrates a five-piece imaging lens assembly which includes an aperture stop, an optical lens assembly, an image plane. The optical lens assembly, in order from an object side to an image side, includes a first lens element with positive refractive power adjacent to the optical axis and having a convex object-side surface, a second lens element with negative refractive power adjacent to the optical axis and having a concave object-side surface, a third lens element and a fourth lens element with refractive power adjacent to the optical axis, and a fifth lens element with negative refractive power adjacent to the optical axis and having a convex image-side surface. At least one of the object-side surface and the image-side surface of the fifth lens element has an inflection point. The image plane is for image formation for an object.