Five-Piece Lens Set with Aspheric Surfaces for Compact Imaging
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Solution Overview
Problem
There is a need for a miniaturized five-piece lens set that can effectively reduce the total length while maintaining high image quality, particularly for electronic products such as digital cameras, webcams, and mobile phones, which require better aberration correction and shorter focal lengths.
Innovation Solution
A five-piece lens set is designed with specific refractive powers, convex and concave surfaces, and aspheric surfaces, along with an aperture stop and image-plane positioned on an image sensor, where the lens elements are made of plastic material, and the relationships between various parameters such as distances and curvature radii are optimized to achieve a shorter total length and improved imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a five-piece lens set is designed with traditional structures, then aberration correction is improved, but total length cannot be sufficiently reduced
Solution Approach 1:
The patent applies aspheric surfaces to the second, fourth, and fifth lens elements, replacing traditional spherical surfaces. This curvature optimization allows for better aberration correction while enabling a shorter total lens length by optimizing the light path through non-spherical surface geometry.
Solution Approach 2:
The patent optimizes multiple parameters including the Abbe numbers of lens elements (vd1-vd5), curvature radii (R1-R6), thicknesses (t1-t6), and spacing distances (d1-d5) to achieve both short total length and excellent aberration correction. Specific parameter ranges are provided to guide the design optimization.
2Length of moving object
If focal length is reduced for miniaturization, then device size is reduced, but imaging quality deteriorates
Solution Approach 1:
By incorporating aspheric surfaces on multiple lens elements, the patent achieves effective aberration correction even with a short focal length. The aspheric coefficients are optimized to maintain high imaging quality while keeping the overall lens length minimized.
Solution Approach 2:
The patent uses a composite lens structure with five different lens elements having different refractive indices and Abbe numbers (vd1-vd5). This multi-material approach allows for sophisticated aberration correction that maintains imaging quality at reduced focal lengths.
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 shortens the total length of the lens set while enhancing imaging quality through better aberration correction and optical performance, making it suitable for miniaturized electronic products.
Implementation Method 1
a five-piece optical lens, in order from an object side toward an image side including a first lens element with positive refractive power having a convex image-side surface near the optical axis
Implementation Method 2
an aperture stop disposed between the object and the second lens element
Data Source
AI summary
The invention discloses a five-piece lens set for capturing images. The lens set comprises a five-piece optical lens. In order from an object side toward an image side, the five-piece optical lens comprises a first lens element with positive refractive power having a convex image-side surface; a second lens element having a convex object-side surface, and at least one of both surfaces thereof being aspheric; a third lens element with positive refractive power having a concave image-side surface, and having one inflection point that is located away from the optical axis; a fourth lens element with positive refractive power, and at least one of both surfaces thereof being aspheric; a fifth lens element having a convex object-side surface and having two inflection points not closed to an optical axis on the object-side surface. The five-piece lens set further comprises an aperture stop and an image-plane.