Five-Lens Camera Module with Aspherical Surfaces for Miniaturization
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Solution Overview
Problem
Current camera lenses in portable electronic devices face challenges in achieving a balance between miniaturization, low sensitivity, high imaging quality, and good machinability while maintaining effective focal lengths and refractive power distribution.
Innovation Solution
A camera lens design comprising five lenses with specific refractive powers, surface shapes, and on-axis distances, including aspherical surfaces, to optimize focal lengths, reduce sensitivity, and improve imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to improve imaging quality, then imaging quality is improved, but device complexity increases
Solution Approach 1:
The camera lens is divided into five distinct lens elements (first lens with positive refractive power, second lens with positive refractive power, third lens with refractive power, fourth lens with refractive power, and fifth lens with refractive power), each with specific surface shapes and refractive properties. This segmentation allows complex optical functions to be distributed across multiple simpler components, achieving high imaging quality while maintaining manageable structural complexity
Solution Approach 2:
The patent employs aspherical lens surfaces in multiple lens elements, where the object side surface of the second lens is convex and the image side surface is concave, and similar configurations for other lenses. These curved surfaces are optimized to correct optical aberrations and improve imaging quality without requiring excessive lens elements, thus balancing imaging performance with structural simplicity
2Length of moving object
If the focal length is reduced to achieve miniaturization, then device size is reduced, but sensitivity increases
Solution Approach 1:
The patent optimizes specific parameter ratios including the effective focal length ratio (0.3 < f2/f1 < 0.7), center thickness to total distance ratio (CT4/TD < 0.35), and separation distance ratio (T45/TD > 0.38). These parameter optimizations enable the lens to achieve a compact form factor while maintaining appropriate sensitivity characteristics through precise control of optical path lengths and focal relationships
Solution Approach 2:
Multiple lens elements with different refractive powers and surface configurations are combined into a single integrated optical system. The first lens (positive power) and second lens (positive power with convex object side) work together with the third, fourth, and fifth lenses to achieve miniaturization while the combined optical path maintains low sensitivity through coordinated design of all five elements
3Length of moving object
If the refractive power is increased to reduce lens length, then lens length is reduced, but manufacturing precision requirements increase
Solution Approach 1:
Different lens elements are assigned different refractive power characteristics and surface shape qualities. The first lens has positive refractive power with specific curvature, the second lens has positive refractive power with convex object side and concave image side surfaces, the third lens has refractive power with specific center and edge thickness ratios (0.2 < CT3/ET3), and similar differentiated designs for the fourth and fifth lenses. This local differentiation allows each element to be manufactured with appropriate precision requirements rather than uniformly high precision across all elements
Solution Approach 2:
The patent utilizes aspherical surfaces with optimized curvature profiles in multiple lens elements. The object side surface of the second lens is convex with specific radius of curvature R3, and the image side surface has corresponding curvature. These controlled curvature variations allow the lens system to achieve compact length while maintaining manufacturable surface precision through gradual rather than extreme curvature changes
4Length of moving object
If the lens separation distance is reduced to achieve miniaturization, then device size is reduced, but imaging quality deteriorates
Solution Approach 1:
The patent optimizes the separation distance ratio T45/TD > 0.38, where T45 is the separation distance between the fourth and fifth lenses and TD is the total distance from the object side surface of the first lens to the image side surface of the fifth lens. This parameter optimization ensures that sufficient separation distance is maintained between critical lens elements to preserve imaging quality while the overall lens length is minimized through compact arrangement of all five elements
Solution Approach 2:
The lens elements are pre-positioned with optimized separation distances during the design phase. The first lens is positioned with specific distance to the second lens, which is positioned with specific distance to the third lens, and so on through the fourth and fifth lenses. These preliminary position optimizations ensure that imaging quality is preserved while achieving miniaturization of the overall lens assembly
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 design achieves miniaturization, low sensitivity, and high imaging quality by balancing refractive powers and surface shapes, enhancing the camera lens's performance and manufacturing feasibility.
Implementation Method 1
a first lens having a positive refractive power; a second lens having a positive refractive power, an object side surface thereof being convex; a third lens having a refractive power; a fourth lens having a refractive power, an object side surface thereof being convex; and a fifth lens having a refractive power
Implementation Method 2
at least one lens surface among an object side surface of the first lens to an image side surface of the fifth lens is an aspherical lens surface
Data Source
AI summary
The present application discloses a camera lens, comprising, in order from an object side to an image side along an optical axis: a first lens having a positive refractive power; a second lens having a positive refractive power, an object side surface thereof being convex; a third lens having a refractive power; a fourth lens having a refractive power, an object side surface thereof being convex; and a fifth lens having a refractive power. An effective focal length f2 of the second lens and an effective focal length f1 of the first lens satisfy: 0.3<f2/f1<0.7, and a distance TTL from an object side surface of the first lens to an imaging plane of the camera lens on the optical axis and an entrance pupil diameter EPD of the camera lens satisfy: TTL/EPD<2.5.