Six-Lens Optical Imaging Assembly with Alternating Powers
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Solution Overview
Problem
Current camera modules in portable devices face challenges in achieving a balance between miniaturization, ultra-large aperture, and long focal length while maintaining high imaging quality and sensitivity, particularly in portrait shooting where a small depth of field is desired.
Innovation Solution
An optical imaging lens assembly comprising six lenses with specific refractive powers and surface types, including aspheric surfaces, is designed to achieve an ultra-large aperture and long focal length, with carefully configured center thicknesses and on-axis distances to reduce aberrations and improve machinability, enabling better portrait shooting effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture is increased to achieve ultra-large aperture for better light gathering and portrait effect, then the imaging quality and depth of field control are improved, but the lens assembly size and complexity increase
Solution Approach 1:
The lens assembly is divided into six individual lens elements with alternating positive and negative refractive powers, allowing each element to be optimized independently for specific optical functions while collectively achieving the ultra-large aperture effect with controlled complexity
Solution Approach 2:
Different regions of the lens assembly are assigned different optical properties through the alternating positive-negative lens configuration, with each lens element having specific curvature and refractive characteristics tailored to its position and function in the optical path
2Length of moving object
If the focal length is increased to achieve long focal length for portrait shooting, then the depth of field is reduced for better subject isolation, but the lens assembly length and size increase
Solution Approach 1:
The six lens elements are arranged in a compact nested configuration along the optical axis with alternating positive and negative powers, allowing the long focal length to be achieved within a minimized overall lens assembly length through nested positioning of optical elements
Solution Approach 2:
The optical design transitions from a simple linear extension to achieve focal length to a multi-dimensional arrangement where alternating positive and negative lens elements create effective focal length through their combined optical power distribution in three-dimensional space
3Manufacturing precision
If the number of lenses is increased to achieve high imaging quality and reduce aberrations, then the imaging performance is improved, but the manufacturing complexity and tolerance sensitivity increase
Solution Approach 1:
The lens assembly uses alternating positive and negative refractive powers with specifically designed curvature radius ratios and thickness parameters, transforming the complexity of six-lens manufacturing into a systematic parameter configuration that achieves high imaging quality while controlling tolerance sensitivity
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 optical imaging lens assembly achieves high imaging quality with an ultra-large aperture and long focal length, providing a smaller depth of field for enhanced portrait shooting and improved blurring effects, while being compact and less sensitive to tolerance variations.
Implementation Method 1
an optical imaging lens assembly, which sequentially includes, from an object side to an image side along an optical axis, a first lens with a positive refractive power, a second lens, a third lens with a positive refractive power, a fourth lens, a fifth lens with a positive refractive power and a sixth lens with a negative refractive power
Implementation Method 2
an object-side surface of the first lens to an image-side surface of the sixth lens includes at least one aspheric mirror surface
Data Source
AI summary
The disclosure provides an optical imaging lens assembly, which sequentially includes, from an object side to an image side along an optical axis, a first lens with a positive refractive power, a second lens, a third lens with a positive refractive power, a fourth lens, a fifth lens with a positive refractive power and a sixth lens with a negative refractive power, wherein a total effective focal length f of the optical imaging lens assembly and an entrance pupil diameter (EPD) of the optical imaging lens assembly meet f/EPD<1.35; and an effective focal length f3 of the third lens, an effective focal length f5 of the fifth lens and an effective focal length f1 of the first lens meet 0.9<(f3+f5)/f1<1.7.